HMS AMBUSH (S120)

'HMS ''Ambush'' (S120)' (possibly S21) is a proposed ''Astute''-class nuclear Fleet submarine of the Royal Navy. Ambush was ordered from GEC's Marconi Marine (now BAE Systems Submarine Solutions) on March 17, 1997. She was laid down at Barrow-in-Furness on 23 October 2003 and is expected to enter service in 2010.
See HMS ''Ambush'' for other ships of the same name.