In baseball, a pitcher who throws underhand. Throwing submarine puts less stress on the pitcher's arm and allows him to throw devastating rising breaking balls like as the frisbee slider and the slurve. Submariners make excellent situational relievers against same-handed hitters because these hitters have a tough time seeing the ball against them.

Some famous submariners include Iron Joe McGinnity, Carl Mays, Dan Quisenberry, and more recently, Byung-Hyun Kim and Chad Bradford.