[blam]

One of the most irritating things is to be snokleing in an old US diesel boat ( four 1600 HP GMC engines) and have it begin to rain. There is a sensor on the snorkel valve that slams shut when water is detected. The engines are still running and damn near sucks you ear drums out. There is also another sensor that shuts the engines down if the 'vacuum' becomes to great. It apparently did not work on the Chinese boat.

[Cincinatus' Wife]

I don't know how you submariners do/did it. You must have nerves of steel.