The risks of releasing mines directly beneath a warship

Could a submarine release buoyant mines directly beneath an enemy ship?

The response considers it an unnecessarily dangerous alternative to torpedoes, especially because the submarine would remain close to the explosions.

The proposal puts buoyant charges on a submarine and releases them beneath a ship's keel. The initial reply compares this with X-craft placing charges beneath Tirpitz, while questioning the extra complication relative to a torpedo. A participant tentatively recalls a buoyant mine or bomb that sank before rising beneath a target. A later clarification makes the risk clearer: the submarine would have to penetrate the screen and approach close enough to be seen from the target. Large underwater explosions would then occur close to its own pressure hull.