Ok here’s what you gotta do. First tame a turtle and name it sacrifice then cryo that guy and find a tuso then tame a tuso. Ok so with the tuso grab the mosa and bring it to the surface. At a certain point near the surface it will completely stop moving and if it does it will only move down. Also when carrying the mosa with a tuso the mosa will attack it unless you bring it above where it is supposed to be so just swim up with it and it will eventually stop attacking. Up if you want idc