A recent study conducted by the British Geological Society (BGS) has provided new insights into the complex geological composition of the North Sea seabed, findings that could have important implications for the protection of undersea cables.

By analyzing data dating back to the 1950s, researchers mapped the materials composing the shallow seabed—specifically the upper two meters where many subsea cables are installed. The study revealed a high degree of variability in seabed composition across relatively short distances, ranging from fine sediments to solid bedrock.

This variation challenges existing guidelines for cable installation, which typically assume a more uniform seabed composed of a single soil type. The presence of mixed materials, according to the BGS, can complicate efforts to bury cables to recommended depths, potentially increasing their exposure to damage.

“Achieving the target burial depth can be difficult given the diversity of seabed materials we encounter,” said Catriona Macdonald, a marine geoscientist at BGS involved in the research. The study suggests that a more detailed understanding of seabed geology could inform better routing and protection strategies for undersea infrastructure.

Undersea cables are crucial for telecommunications and power transmission, but they remain vulnerable to damage from fishing activities and ship anchors. Enhanced seabed mapping may help mitigate these risks by enabling more precise placement and protection measures.

The BGS study underscores the importance of incorporating geological complexity into subsea cable planning and may prompt revisions to current industry standards to improve the resilience and reliability of the North Sea’s underwater networks.