UPDATE: Now contains the final of the three Rammerheads. This one swims vertically through the level, just set it on a generator ad watch it do the rest. It replaces the SMB Girder Lift, so make sure you set it to "UP" or you'll have some backwards swimming sharks... Also, you might want to attach some invisible spikes or something to it, because, through trial and error there is no way to make the Lift hurt the player when touched unfortunately otherwise it would be perfect.
Screenshot: