Chinese 55mm DP-65 remotely controlled antidiversion grenade launching system spotted

on one of those South China Sea Garrisons.   Besides its antidiversion role,  I think it is also a perfectly fine fishing tool.

The 55mm DP-65 remotely controlled antidiversion grenade launching system is designed for protection of ships against attacks of underwater combat swimmers at external roadstead open anchor stops and bases, for protection against attacks of underwater combat swimmers at water-development works, sea platforms and other important sea and coastal installations.