You can shoot the racks off for sure, but that's all. Still, it's a last ditch measure. When they pass over, surface just to where you can man it and shoot the racks off...You can dive and at least they can't drop on you.
You can also surface beside a damage ship that is dead on the water and as long as you're right beside it, the enemy won't shoot you, but go an inch too far...wham. Course I haven't done that in so long not sure how well it works with TMO now. Really a cheat of sorts. Course the ship your sitting beside can shoot you, so be careful....
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