Originally Posted by
ChrisJ800
The US can have subs or used to in shallow harbors like Pearl Harbor or Subic bay. So why cant we?
As Rattman said, it’s the depth of water around the harbour that is important.
In deep water, the submarine can change depth to sit just above or below temperature inversions to reduce the chances of detection from noise produced by the boat. In shallow water, the submarine captain has fewer evasion choices so enemy ASW assets (including submarines) can focus on the waters around the harbour to pick off submarines entering or leaving.