UPDATE: A 2K spokesperson has told CVG that the publisher "can't confirm any content details at this stage."

UPDATE 2: Game Informer mag has pretty much debunked the web 'details' altogether. It says in a statement:

"The Bioshock 2 news that is running around the web is quite...interesting. While we cant confirm or deny anything that is being said, let us give you a quick piece of advice: don't believe everything you read from some dude on the Internet.

"If people had actually read the Bioshock 2 cover story from this month's issue...well, you will see how it matches up with the real deal when it arrives this weekend, as the rumors floating around are so amazingly wrong on a very "big" point. Watch for the magazine in stores and in mailboxes this weekend, so you will have your information soon enough."

ORIGINAL STORY:

What are being reported as the first details on BioShock 2: Sea of Dreams have emerged via the new issue of US mag Game Informer.

According to supposed subscriber holders on 2K's forums the second game will feature two-player co-op, underwater exploration levels and controversially, no Big Daddies what-so-ever.

Potential Spoilers Ahead

Apparently the game (which has now been confirmed for a PS3 release) starts of with you, private investigator Jack Abbott, as your daughter's snatched from your New York City beach house by the now infamous Big Sister - the main horror of the game.

After a boat chase and deadly encounter with the mysterious assailant you're knocked out and end up back in the underwater city of Rapture.

Seven years have gone by since the events of the first game and Rapture's even more flooded and ruined than before - some levels will even require you to don a diving suit to progress.

But this time you're not the only one who stumbles upon Rapture... according to the details, at some point in the game a Soviet submarine stumbles upon the city and you're left as the sole defence against the dirty Ruskies from acquiring Adam and using it against the Americans in the Cold War.

Soviet baddies are said to be far smarter than the dopey Splicers, using cover and flanking intelligently as you'd expect.

In the search for your missing daughter you'll progress through unexplored levels of the city including a Zoo complete with freakish, spliced animals. A spliced Rhino and an "epic underwater boss fight" with a gigantic squid are noted.

New enemies include spliced dogs and bipedal robots which can be hacked in the same way as the machines from the first game, claim 2K forum boys.

Two new plasmids have also been detailed; one slows down time for a few seconds, the other, more interesting mutation is Telepathy, which gives you the ability to eavesdrop on the thoughts of NPCs and gain information, such as the combination for a keypad.

Co-op and the cutting of Big Daddies might raise a few eyebrows, but we're confident this'll turn out brilliant. We'll verify the info when a copy of Game Informer turns up...