Game Revolution - Some cheats for the version on the Playstation. - http://www.gamerevolution.com/oldsite/games/codes/sony/xcomterror.htm
GameSpot review - Review by Ron Dulin, [7.2]. "Apart from new art and a handful of new combat options, this is exactly the same game as UFO Defense, only much more difficult." - http://www.gamespot.com/pc/strategy/xcomterrorfromthedeep/review.html
GameWinners.com - Offers a cheat for the DOS/Windows version as well as links to strategy guides. - http://www.gamewinners.com/DOSWIN/blxcomterrordeep.htm
X-COM - Terror from the Deep - Has fan fiction and downloads. - http://www.franken.de/users/speedy/hakan/hobbies/games/tftd/Welcome-e.html