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The Submarine form can be used to dive through bodies of water, since normal Yoshis are unable to dive, and fire homing torpedoes at enemies. Getting hit in this form causes the player to briefly lose control of the Submarine, making it more difficult to reach the Yoshi Block before the transformation's time runs out.
The Submarine reappears in Yoshi's Island DS. It is no longer able to launch torpedoes, however. In Yoshi's New Island, the Yoshi must enter a Whirly Gate with its picture to become Submarine. It works similarly to the original, except that the player must tilt the system to steer it.
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