Sound FX

http://soundbible.com/suggest.php?q=warning&x=13&y=6

i have used this webiste to download sirens for the point where alpha escapes and where preston gets a little confused and a little angry as He realises Alpha has escaped.

Another example's we may use are these
http://www.youtube.com/watch?v=k2VhB7vaZI0&feature=related

http://www.youtube.com/watch?v=AfuQd_xZlKw&feature=related