Subsea Cables

Isle of Man Submarine Fibre Infrastructure Advisory Report

Date: 2026-08-23

Scope: Submarine cable capacity, resilience, market structure, satellite alternatives, peering, BGP sovereignty, and policy recommendations for the Isle of Man (IoM).

Current Infrastructure Assessment

The Isle of Man is unusually well-connected for an island of its size, with 8 submarine cable systemslit capacity is actually available, how much dark capacity remains, and how much of the island’s traffic is still concentrated through a small number of commercial and operational chokepoints.

Submarine cable inventory and strategic significance

Cable era	Indicative role	Assessment
1859 telegraph cable	Historic legacy route	Strategic and symbolic only; no material role in modern resilience.
20th century copper / early telecom systems	Voice and early data era	Likely retired or functionally obsolete for modern internet carriage.
Modern fibre systems pre-2020	Primary commercial connectivity	Still important, but increasingly dominated by newer high-capacity systems.
2022 CeltixConnect-2 / Havhingsten	Latest high-capacity route	Major step-change in capacity; headline design capacity cited at 300 Tbps.

Important caveat: design capacity is not the same as usable capacity. The island’s lit capacity depends on how many wavelengths are deployed, what terminal equipment is installed, and how much of the system is actually sold into service. The dark capacity is the latent headroom that can be activated by adding optical equipment rather than laying new cable.

Lit and dark fibre capacity

On paper, a modern system with a 300 Tbps design envelope is enormous relative to the needs of an 84,000-person island. Even if only a modest fraction is lit, the island’s aggregate international bandwidth is likely sufficient for current consumer demand by a very wide margin. The real issue is not raw throughput; it is route diversity, commercial concentration, and operational resilience.

Practical assessment:

• Consumer demand today: likely in the low single-digit Tbps range at peak, not hundreds of Tbps.
• Enterprise and wholesale demand: materially smaller than consumer aggregate, but latency-sensitive and resilience-sensitive.
• Dark capacity: likely substantial on newer routes, but not automatically accessible if landing station access, backhaul, or commercial control is constrained.

Redundancy and single points of failure

The Isle of Man’s resilience is better than many islands, but it is still vulnerable to a familiar island pattern: multiple cables, but correlated failure domains. The key risks are:

• Landing station concentration: if several systems terminate in the same or nearby facilities, a local power, fire, flood, or security incident can affect multiple routes simultaneously.
• Backhaul concentration: if the island’s domestic core depends on one or two terrestrial trunks from landing stations to the main exchange/core network, then a submarine outage may be survivable but a terrestrial cut could still isolate users.
• Commercial concentration: if one wholesale operator controls most international capacity, “redundant” cables may still behave like one economic bottleneck.
• Repair logistics: submarine repair in the Irish Sea is faster than transoceanic repair, but weather windows, vessel availability, and permit processes still matter.

Bottom line: the Isle of Man appears to have good headline diversity but only moderate operational diversity. The island is not fragile in the sense of having only one cable, but it may still be vulnerable to a small number of shared dependencies.

Assessment of current state

Metric	Assessment	Comment
Number of submarine systems	Strong	Eight systems is a healthy count for an island of this size.
Headline capacity	Very strong	300 Tbps-class design capacity is far beyond present demand.
Lit capacity	Likely adequate to abundant	Actual lit capacity is likely a small fraction of design capacity.
Dark capacity	Potentially very large	Useful as a strategic reserve if commercially and technically accessible.
Route redundancy	Moderate to strong	Depends on landing station and backhaul diversity.
Single points of failure	Material	Likely at landing, backhaul, power, and wholesale control layers.

Demand Forecast

The question for the Isle of Man is not whether it has enough capacity for 2026. It does. The question is whether it will remain comfortably future-proof through 2030 and 2040 as usage shifts from consumer browsing to cloud-heavy, AI-heavy, always-on, low-latency digital services.

Demand drivers

• AI workloads: training is unlikely to be hosted locally at scale unless the island attracts a data centre cluster; inference and model serving could grow rapidly if local firms use cloud AI services.
• Cloud computing: increasing dependence on SaaS, IaaS, and backup replication increases both bandwidth and resilience requirements.
• Remote work: high-quality symmetric broadband is now a baseline expectation for professional households.
• Streaming: 4K streaming is now mainstream; 8K remains niche but will grow slowly.
• IoT growth: mostly modest in bandwidth terms, but important for always-on connectivity and edge services.
• Data sovereignty: more public-sector and regulated-sector traffic may need local retention, local processing, or auditable routing.

2030 outlook

By 2030, the island’s current submarine capacity should still be adequate if the market remains relatively small and no major digital-industrial policy is pursued. However, “adequate” is not the same as “strategically comfortable.”

2030 risk factors:

• Higher per-household upstream usage from remote work, video collaboration, and cloud backup.
• More business-critical dependence on low-latency international connectivity.
• Potential growth in local hosting, fintech, and AI-assisted services.
• Greater expectation of resilience as a utility, not a best-effort consumer service.

Opinionated view: the current system is likely future-proof for 2030 in raw capacity terms, but only if the island avoids complacency on resilience, wholesale competition, and domestic backhaul.

2040 outlook

By 2040, the capacity question becomes less about households and more about whether the Isle of Man wants to be a digital jurisdiction with meaningful cloud, fintech, gaming, remote services, and possibly AI-enabled business activity.

If the island remains a consumption-only market, current capacity is probably still enough. If it aims to attract:

• edge data centres,
• regulated cloud hosting,
• financial services infrastructure,
• gaming and interactive media platforms,
• AI inference nodes,

then bandwidth alone will not be the limiting factor. The limiting factors will be:

• latency to major hubs,
• power availability and price,
• carrier neutrality,
• regulatory credibility,
• and the ability to guarantee multi-path resilience.

Opinionated view: the island is probably not fully future-proof for 2040 as a digital economy platform unless it actively invests in competition, peering, and sovereign connectivity policy. The fibre itself may be enough; the ecosystem may not be.

The e-llan Question

e-llan, the fibre operator associated with the Interconnector, ceased trading in December 2024. This is a significant market event because submarine cable systems are not just physical assets; they are also commercial and operational platforms. When a fibre operator exits, the consequences are usually felt in three areas: competition, pricing, and investment confidence.

Implications for competition

If e-llan was a meaningful wholesale alternative, its exit reduces the number of independent routes to market. In a small island market, even one operator’s disappearance can materially increase concentration.

• Less wholesale choice: retail ISPs may have fewer options for international backhaul.
• Higher switching costs: customers may face contractual and technical lock-in.
• Weaker bargaining power: absent a credible alternative, incumbent pricing power rises.

Implications for pricing

In island markets, pricing is often held in check not by perfect competition but by the threat of bypass, regulatory intervention, or excess capacity. If e-llan’s exit removes a competitive constraint, the likely outcomes are:

• higher wholesale prices, or slower price declines;
• less aggressive service innovation;
• greater reliance on bundled or opaque commercial terms;
• potentially weaker service-level commitments.

Opinionated view: the Isle of Man should assume that the market has become more concentrated unless and until a genuinely independent replacement operator emerges.

Should the government intervene?

Yes, but selectively. The government should not attempt to run a telecom monopoly, but it should intervene to preserve effective competition and prevent strategic infrastructure from becoming a de facto private utility with no credible discipline.

Intervention should focus on:

• ensuring open access to landing and backhaul infrastructure;
• preventing foreclosure of rival ISPs and enterprise users;
• requiring transparency on wholesale pricing where market power exists;
• supporting a neutral infrastructure model for future capacity expansion.

Recommended stance: intervene on market structure, not on retail prices directly. The goal should be to keep the market contestable.

Starlink & LEO Satellite

Starlink’s current consumer offering of around 100 Mbps for £35/month changes the economics of island connectivity. LEO satellite is no longer a novelty. It is a credible access technology for some households and some business continuity use cases.

Where LEO can substitute for fibre

• Backup connectivity: excellent as a failover path for homes, farms, small offices, and critical services.
• Remote or hard-to-serve locations: useful where trenching or last-mile fibre is expensive.
• Disaster recovery: valuable when terrestrial and submarine routes are impaired.
• Temporary deployments: construction sites, events, maritime operations, and emergency response.

Where LEO cannot replace fibre

LEO satellite is not a full substitute for fibre in latency-sensitive or high-assurance environments.

Use case	LEO suitability	Reason
Financial services trading	Poor	Latency, jitter, and routing consistency are inferior to fibre.
Gaming	Mixed	Playable for many games, but competitive gaming suffers from latency and jitter.
Video streaming	Good	Throughput is usually sufficient.
Remote work / SaaS	Good to very good	Acceptable for most office workloads.
Primary connection for regulated enterprises	Limited	May be acceptable as secondary path, not ideal as sole path.

Opinionated view: LEO should be treated as a complement to fibre, not a replacement. For the Isle of Man’s financial services and gaming sectors, fibre remains the gold standard because it offers lower latency, lower jitter, better routing predictability, and stronger service guarantees.

Internet Exchange Point

ManxIX exists, but it currently has no active IoM peers. This raises the classic small-island IXP question: is a local exchange worth it for a population of 84,000, or should traffic simply hairpin to London or Dublin?

Economic case for a local IXP

A local IXP makes economic sense when there is enough local traffic to justify keeping island-to-island and island-to-local traffic on-island. For the Isle of Man, the direct bandwidth savings may be modest, but the strategic benefits can still be real.

• Lower latency for local services: local-hosted content, public services, and enterprise applications benefit from shorter paths.
• Reduced transit costs: local peering can keep domestic traffic off expensive international links.
• Resilience: local exchange infrastructure can preserve some communications even during upstream disruptions.
• Digital ecosystem signal: an IXP can encourage content caching, CDN presence, and local hosting.

Arguments against a local IXP

• Scale problem: 84,000 people is small; traffic volumes may be too low to sustain broad peering participation.
• Chicken-and-egg issue: without local content providers and networks, the IXP has little value; without value, they do not join.
• Operational overhead: even a small IXP needs governance, neutral facilities, monitoring, and security.
• Alternative hubs are strong: London and Dublin already offer deep peering ecosystems and CDN presence.

Verdict on ManxIX

London/Dublin peering is sufficient for most commercial purposes today. However, a local IXP still makes sense as a strategic resilience and sovereignty asset if it is kept lean and neutral.

Opinionated view: the island should not expect ManxIX to become a major traffic hub. It should instead be positioned as a minimal-cost local peering and caching point for public sector, ISPs, and any local content or cloud nodes that emerge.

Recommended IXP policy

• Keep ManxIX operational, but do not overspend on prestige infrastructure.
• Use it to anchor public-sector traffic, local DNS, caches, and emergency communications.
• Incentivise at least a few anchor participants: government, incumbent ISP(s), and any local hosting provider.
• Enable CDN on-ramping and cache deployment where possible.

BGP & Autonomous Systems

The Isle of Man has its own country code, IM, but most internet traffic still routes through UK-based autonomous systems. This is common for small territories, but it has implications for sovereignty, routing control, and resilience.

ASNs originating from the Isle of Man

There are relatively few autonomous systems that are clearly Isle of Man-originated. In practice, most end-user traffic is sourced from networks that are legally or operationally linked to the UK, even when serving Manx customers. The effect is that the island’s internet identity is often administratively distinct but operationally dependent.

Implications:

• Routing sovereignty is limited: the island does not fully control how its traffic exits to the global internet.
• Policy leverage is weak: if key networks are UK-based, local regulators have less direct influence over peering and transit strategy.
• Resilience depends on external AS policy: upstream routing decisions can affect latency, path diversity, and outage handling.
• Data sovereignty is not guaranteed by geography: data may be stored or processed outside the island even if accessed locally.

What internet sovereignty would require

True internet sovereignty does not mean isolation. It means the ability to make informed choices about:

• where traffic enters and leaves the island;
• which networks are preferred for critical services;
• how public-sector traffic is routed and logged;
• what minimum domestic infrastructure is required for continuity.

Opinionated view: the Isle of Man has jurisdictional sovereignty but only partial network sovereignty. That is acceptable for a consumer market, but not ideal for a digital finance or regulated-services strategy.

Recommendations

The Isle of Man should treat subsea fibre as critical national infrastructure, not merely a telecoms asset. The island’s current position is good, but it is not self-sustaining without policy action.

1. Protect and diversify wholesale access

• Mandate open, non-discriminatory access to landing and backhaul facilities where market power exists.
• Require wholesale transparency for international capacity pricing and service levels.
• Prevent any one operator from controlling both the dominant route and the dominant domestic backhaul path.

2. Build a formal resilience standard

• Set a minimum requirement for critical services to have at least two independent international paths.
• Define independence by landing station, power, duct, and backhaul separation, not just by cable name.
• Test island-wide failover annually, including submarine outage simulations.

3. Keep ManxIX, but reposition it

• Maintain ManxIX as a low-cost local peering and caching platform.
• Use public-sector demand to create an anchor tenant base.
• Encourage CDN nodes, DNS resolvers, and cloud on-ramps to locate locally where commercially viable.

4. Use LEO as resilience, not replacement

• Subsidise LEO only for backup, emergency, and hard-to-serve locations.
• Do not allow satellite to become an excuse to underinvest in fibre.
• Require critical operators to maintain terrestrial or submarine primary paths.

5. Create a data sovereignty and routing policy

• Define which public-sector and regulated workloads must remain on-island or within approved jurisdictions.
• Publish a government routing and hosting policy for sensitive data.
• Encourage local hosting for low-latency and sovereignty-sensitive services.

6. Prepare for a post-e-llan market structure

• Commission an urgent market review of wholesale fibre competition.
• If necessary, support a neutral infrastructure vehicle or regulated access regime.
• Ensure no single commercial failure can strand the island’s international connectivity strategy.

7. Treat submarine cables as an economic development asset

• Market the island’s connectivity to financial services, gaming, and remote-first firms.
• Pair fibre policy with power, planning, and tax policy to attract digital investment.
• Target modest, realistic wins: edge hosting, backup sites, and latency-sensitive services rather than hyperscale data centres.

Overall Conclusion

The Isle of Man is well supplied in physical submarine cable terms, with eight systems and a modern high-capacity route that appears to dwarf current demand. However, the island’s real vulnerability lies in commercial concentration, landing/backhaul dependencies, and limited network sovereignty.

For 2030: the current infrastructure is likely sufficient in capacity terms, but only if competition and resilience are actively managed.

For 2040: raw fibre capacity may still be enough, but the island will need stronger policy, peering, and sovereignty controls if it wants to remain competitive as a digital jurisdiction.

Most important judgment: the Isle of Man does not have a capacity problem; it has a governance and resilience problem. That is solvable, but only with deliberate intervention.