Depth-charge cluster munitions from 86

Could the depth-charge cluster bombs in the light novel series 86 work as real weapons?

The concept could work, but reliably activating the dispersed depth charges would be the main engineering problem.

The question borrows a depth-charge cluster bomb from the light novel series 86. Dispersing several charges is mechanically plausible because nothing in the basic concept prevents it. The difficult part would be arming and activating each charge safely and reliably after dispersal. The fictional weapon therefore points to a real engineering problem in underwater-weapon fuzing and control.