usually they can take a splash or 2 m8 but stuck in water or muds a no go unless youve done some waterproofing first
plastic dip stuff works good or balloon round the esc and reciever etc dont worry bout the motor shouldnt have aproblem unless its a BL motor and not waterproof []

If any of mine do get submerged i stop and let them dry out properly saves damaging more parts then.