Help with movie sound

Rating: 10/10 (25 January 2008)

hi, I wanted to know if you could help me, I am trying to figure out what type of siren (evacuation, bomb threat, civil) is used in the movie aliens from 1986 it is at the scene of the 15 min. ship self destruct sequence towards the end of the film. I have looked and looked for almost an hour and had no luck . here is a link to hear it in the background of the scene : http://www.youtube.com/watch?v=OzmZiZaj81o any help is much and i repeat much appreciated as I have not found any information on the sound on IMDb or on the internet itself it is just something i would really like to know and would like anyone to tell me if they know