I know the one you're talking about. Used to be utter carnage in that tunnel. If I remember correctly there were more open areas at each end where armour spawned as well. You'd always get some numpty try to charge right through in an MBT.It's been a few years since I've played BF3 or 4 and I struggle to remember which game had which maps but to be honest, they were both pretty good for maps that made you hate attacking.
Especially that one that had a big **** off tunnel in it but wasn't Metro. Had helicopters too.