Roughly 99 percent of data moving between the United Kingdom and Europe and the wider world is described as travelling by sea rather than by satellite. Modern fibre-optic cables carry far more capacity than space links, but they are fragile and expensive, so route selection affects cost as well as resilience. Survey ships can map safe corridors, inspect the seabed, and check whether someone has interfered with a cable. Hydrography therefore contributes to grey-zone security and economic continuity as well as safe navigation.
Notable Point · 30:49-32:28
Undersea cables make hydrography part of grey-zone security
Surveying cable routes protects the high-capacity links that carry international communications and expose fragile infrastructure to interference.