Main Tank - Top
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The hole is surrounded by spikes, which inflict 20 HP to Luigi and pop his inner tube upon contact, so he must avoid the spikes and launch Clem into the spikes to deflate his inner tube for him to be vulnerable. Gooigi cannot float on the inner tube, but he can assist whenever Clem is forced out of the water by capturing him. After Clem is defeated, Luigi or Gooigi accidentally drops the elevator button down to the Main Tank, requiring Luigi to drain the water.