[BillCar]

Think I just found something great!

http://www.hnsa.org/sound/soundinthesea/track32.mp3

This is a recording, taken inside a submarine, of active sonar striking it. This is from a recording that was declassified by the USN in the 1950s and released by a sonar development company in 1960, and so would perhaps date from the 1940s.

What we hear is the squeak and, a second later, a sound pretty close to the one I made for this mod: a short, metallic impact sound.

The squeak can be heard throughout the recording, and the metallic impact is audible twice: listen for the ping 3 seconds into the recording and the impact at 4 seconds, and then again with the ping at 13 seconds and the impact at about 15 seconds.

This is not recorded over hydrophones, it sounds like it is recorded on an open microphone inside the submarine.

This will be the basis for the new sound I make. I will take the old recording, lower it slightly, and preface it with the squeak.