[Nita Nupress]

I've been wondering myself why they were not using active sonar.
Is that common practice during peacetime? If so, why? Who are we hiding from?

/stupid questions

[GGpaX4DumpedTea]

"Who are we hiding from?"

You can't hide a nuke sub that is doing 30 kts. Subs do not run silent at that speed. So why no active sonar? A very good question. Next question: At 30 kts, would active sonar have given them warning soon enough to avoid the "mountain"?

[dread78645]

I've been wondering myself why they were not using active sonar.
Is that common practice during peacetime? If so, why? Who are we hiding from?

Active sonar frequency range is designed to localize discrete metal objects --AKA "targets".
Regardless of what you see on "Voyage to the bottom of the Sea" and Hollywood movies, it is very poor for general navigation.

[BykrBayb]

Who are we hiding from?

Everybody.

Finally, a question I can answer!