Sensuikan Heihō

Sensuikan Heihō are invincible Shy Guys that drive single-seated submarines. They patrol the ocean waters surrounding Yoshi's Island, and fire torpedoes (similar in design to Torpedo Teds) at intruders.

Sensuikan Heihō only appear in the game Yoshi's Story and even then only in the third part of Stage 5-1: Lots O'Jelly Fish.