The trailer at the E3 expo for MW3 was poorly researched and poorly executed. I know it's just a video game but obviously they just have no idea of what they are depicting and it sticks out like a sore thumb.
For starters I was stationed on a Spruance Class Destroyer (Anti-Submarine Warfare) USS JOHN HANCOCK DD-981 many years ago. The clip they showed at E3 showed seals swimming around an enemy sub up close whilst it is pinging sonar plus they are traversing in it's wake with no propellor wash effect. After the sonar ping had busted their eardrums, caused major head trauma and basically turned their insides to jelly the Propellor wash would take care of the rest. Perhaps the old IW guys would have spotted that major flaw.
I know, I k now it's a stupid game and nobody is supposed to care but it just shows you how lazy they are and don't even bother paying attention to details like how sonar is extremely hazardous and deadly at that range. . I won't even go into the seal swimming up into the propellor wash as that just made me face palm.
In other words Sledgehammer games FAIL!!