The Wilhelm cry is pushed by the actor Sheb Wooley. Its first use dates from the movie "The Adventures of Captain Wyatt" in 1951. Since then, it has been popularized by Ben Burtt on the saga Star Wars and in several hundred movies, series, commercials and video games. More infos : en.wikipedia.org/wiki/Wilhelm_scream. Duration: 00:01.
Two-tone siren of the French Gendarmerie. Doppler-Fizeau effect of a passage from left to right, made by computer. No engine noise, it's up to you to choose the noise of your vehicle according to your project. Duration: 00:20.
Several beeps of an active sonar. This is a low frequency sonar (long range but low definition). It is a sine wave of 1040 Hz frequency easy to put in loop. In reality, a military submarine usually has passive sonar, more sonar info: en.wikipedia.org/wiki/Sonar. Duration: 00:21.