Aquatic Torpedo
From Warhammer 40k - Lexicanum
The Aquatic Torpedo is a weapon used by the bomber aircrafts like the Marauder of the Imperial Navy to sink enemy aquatic ships.[1]
Description
Having a range of at least thirty miles, the Aquatic Torpedo is designed to travel ten feet under the water's surface. It is dropped from its carrying aircraft into the ocean during an attack run, impacting on the part of the hull of an enemy vessel below waterline.[1]
A Marauder can carry a single Aquatic Torpedo slung under its belly.[1]