depth charge
depth bomb

This was the first use of the depth charge in action.

Over a seven hour period a number of depth charges were dropped without effect.

At 14:05, the first of 25 depth charges was dropped.

Depth Charge was a year younger than his famous half brother.

On that first pass his depth charges did not release.

She was one of the first vessels to use depth charges.

He was still at it when the first depth charge exploded.

At 1718 she dropped a pattern of 9 depth charges.

At 1452, she established contact and dropped six 600-pound depth charges.

Each one sets itself off like a depth charge in the reader's head.