The Greenland-Iceland-United Kingdom gap spans a broad part of the North Atlantic. Its strategic importance came from the hydrophone and patrol line that NATO established across likely Soviet submarine routes. That made it a useful place to organize detection and defence without forcing ships through a narrow channel. Gibraltar and Malacca offer a contrasting kind of choke point, where geography itself constricts a ship's passage.
Notable Point · 25:20-26:36
The GIUK gap as a North Atlantic surveillance line
The broad Greenland-Iceland-United Kingdom gap worked as a surveillance line rather than a true maritime choke point such as Gibraltar or Malacca.