I want to be an underground man who feeds on coal and is too heavy to float in the water. However, it seems that swimming, a power type, can only be enabled but not disabled.

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Machine translation, the following is the original：
我想做一个以煤炭为食，而且因为过于沉重无法在水中漂浮的地底人。但是看了一下，Swimming这个power types似乎只能启用而不能禁用游泳。

Not possible at the moment, but I'll mark this as a feature request to maybe implement it in a future update.