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.
Several beeps of an active sonar. This is a low frequency sonar (long range but low definition). It is a triangular wave of 1030 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: 00:31.
In signal processing, white noise is a random signal having equal intensity at different frequencies, giving it a constant power spectral density (en.wikipedia.org/wiki/White_noise). A sound to use only wav, aiff or flac formats, because the other formats denature the interest of the sound. Duration: 05:00.
Song of robin, a garden bird. He cries from a tree, spacing his songs for 2 to 3 seconds, then stops, changes his tree and starts again a few dozen times and so on around his territory. Duration: 00:02.