LeMU is the primary location of Ever17. It is an underwater theme park that consists of Insell null, the floating island, and the three underwater floors: Ersteboden, Zweitestock, and Drittestock. The theme park is kept at a constant 6 atmosphere of air pressure in order to keep the water outside from breaking in. The air composition of LeMU is that of saturation diving and contains a fairly high amount of helium, requiring guests to wear earpieces that adjust people's voices so that no one sounds high pitched.

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