BUGIO: A Short-Distance Submarine Cable in Portugal
The BUGIO submarine cable is a 73-kilometer system connecting
Carcavelos and
Sesimbra, two coastal towns in Portugal. Owned by Altice Portugal, BUGIO has been in service since 1996, according to GeoCables records. Its relatively short length and domestic route make it an important part of Portugal's telecommunications infrastructure, though its technical specifications and design capacity remain undisclosed in public sources.
What stands out about BUGIO is its role as part of a highly interconnected cable landing environment. Both Carcavelos and Sesimbra host multiple other submarine cables, making this corridor a critical hub for regional and international connectivity. However, publicly available information about BUGIO's technology, fiber count, and supplier is limited, leaving open questions about its original design and upgrades over time.
Quick facts
| Cable name | BUGIO |
| Length (km) | 73 |
| Ready-for-service year | 1996 (GeoCables database) |
| Owners | Altice Portugal |
| Status | In service |
| Design capacity | Not disclosed |
| Fiber pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing points | Carcavelos (Portugal), Sesimbra (Portugal) |
Route
BUGIO connects Carcavelos and Sesimbra, two towns located along Portugal's Atlantic coastline. Carcavelos is situated near Lisbon, making it a strategic landing point for both domestic and international cables. Sesimbra, located further south, is also a significant node in Portugal's cable network. The 73-kilometer route is entirely within Portuguese territorial waters, simplifying regulatory and maintenance considerations compared to international cables.
Both landing points are hubs for other submarine cables. Carcavelos hosts seven additional systems, including major international cables like
2Africa and
Africa Coast to Europe (ACE). Sesimbra is similarly connected, with systems such as
Equiano and
Europe India Gateway (EIG) landing there. These overlapping networks enhance redundancy and connectivity for Portugal and the broader region.
Why it was built and what it carries
BUGIO was likely built to enhance domestic connectivity between Carcavelos and Sesimbra, supporting Portugal's telecommunications infrastructure. Its short length suggests it primarily serves regional traffic rather than acting as a high-capacity international link. While its design capacity and fiber count are not disclosed, its role as part of Altice Portugal's network indicates it supports data, voice, and potentially internet services for the region.
History: what can be established
GeoCables records BUGIO's ready-for-service year as 1996. This aligns with a period of significant investment in submarine cables globally, as operators sought to expand connectivity and modernize networks. However, no alternative dates or conflicting records have surfaced in industry sources, leaving 1996 as the most reliable estimate for its commissioning.
Publicly available details about upgrades or maintenance since its launch are scarce. Given its age, it is plausible that BUGIO has undergone modernization to remain operational, but attributing this without operator documentation would be speculative.
Capacity and technology
BUGIO's design capacity, fiber pairs, and supplier are not disclosed in public sources. Without these details, it is impossible to assess the cable's maximum data throughput or technological sophistication. Given its age, the cable may have originally been designed with lower capacity compared to modern systems, but any upgrades over time remain undocumented. Publicly available data does not confirm whether BUGIO uses optical amplification or other advanced technologies.
Latency: the physics
Theoretical one-way light propagation over BUGIO's 73-kilometer length is approximately 0.4 milliseconds, with a round-trip time (RTT) floor of 0.7 milliseconds. These calculations assume ideal conditions and do not account for land tails, terminal equipment, or routing delays, which increase real-world latency.
Live measurements from remote probes show significantly higher RTTs to Carcavelos, ranging from 78.4 ms (Odessa) to 252.5 ms (Sydney). These values reflect the full internet path, including terrestrial and other submarine cable segments, rather than BUGIO's isolated performance.
Redundancy: what happens if it breaks
BUGIO's landing points are well-integrated into Portugal's cable network, providing redundancy through multiple alternative systems. Carcavelos hosts seven other cables, including 2Africa and
Columbus-III Azores-Portugal, while Sesimbra connects to systems like Equiano and
SAT-3/WASC. In the event of a fault on BUGIO, traffic could be rerouted via these alternatives, minimizing disruption.
Repair logistics for submarine cables typically involve deploying specialized cable ships to locate, retrieve, and repair the damaged section. Given BUGIO's short length and proximity to shore, repairs would likely be faster and less complex compared to longer, transoceanic cables.
Bottom line
- BUGIO is a 73-kilometer submarine cable connecting Carcavelos and Sesimbra in Portugal.
- Owned by Altice Portugal, it has been in service since 1996, according to GeoCables records.
- Design capacity, fiber pairs, supplier, and technology are not disclosed in public sources.
- Its theoretical RTT floor is approximately 0.7 ms, though real-world latency is higher.
- Redundancy is enhanced by multiple alternative cables at both landing points.