[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.

[Nita Nupress]

Regardless of what you see on "Voyage to the bottom of the Sea" and Hollywood movies, it is very poor for general navigation.

Thanks. I didn't know that.

I'm just glad I didn't ask anyone why he couldn't see the mountain through the window. :-)

(Replica of a mid-19th-century wooden submarine)