Sledgehammer boss Glen Schofield has said that the studio's cancelled Call of Duty game, now known to be a third-person action-adventure game, had an atmosphere similar to Dead Space.
The game was supposed to take place in an alternate era to Modern Warfare, according to the GM.
"It was a third-person action-adventure game, it was a shooter, and it was not based in this era," Schofield told Gamerzines at CoD XP.
"It had a lot of atmosphere like, I should say Dead Space a little bit because you were underground in some places. You know, war is hell, war is scary and that's what we were trying to get across. We did a tonne of research."
Schofield and Michael Condery founded Sledgehammer in November 2009 after the pair left Dead Space studio Visceral Games.
The decision to cancel the third-person title and work on Modern Warfare 3 with Infinity Ward was a decision made by the studio, not Activision, Schofield insisted.
"They came to us and said, 'would you guys work on it?'. And at first we told them we'd need to talk to the team and that we'd get back to them in a couple of days. And they were like, 'well, we really, really like you, you're the ones that Infinity Ward have chosen'."
Modern Warfare 3 releases on November 8 on PS3, 360 and PC.