"Use HE shells on merchants' radio to prevent them from transmitting your position.."

[Sailor Steve]

Originally Posted by Hartmann

It depends but could be very difficult.

In daytime you have to surface at visual range of the ship, and prepare the gun to fire, it could take several seconds , enough time for the ship to use the radio .

In the case that your crew is very fast and can fire in seconds you still have to hit the radio at the first shot and know the exact place.

The conning tower breaks the surface first. It takes several more seconds before the deck is above water. Twenty seconds to get the hatch open and get the crew out on deck. If the first man out unplugs the tampon, and the second man out opens the ready-use locker and grabs the first shell, and the third man out opens the breach, and the fourth man starts training the gun onto the target, it will probably still be more than a minute before the gun is ready to fire. Then you still have to deal with the fact that in anything but a dead-calm sea the submarine is a relatively unstable gun platform.

Then you have to find the radio shack.

Originally Posted by Ducimus

See that structure topside with the big antenna sticking out of it ?

Yes, sir. That's the radio shack.

You and Wentz get on the deck. On my command, put a shell right through the god damn porthole.

Of course the radio antenna is mounted to the mast, and the radio shack is somewhere inside...