Reserve crews for laid-up ships

How does a navy prepare in peacetime if it has excess ships laid up in dry dock but can only crew them during conflict?

It needs intensive regular and reserve training so personnel can step up quickly and become familiar with the laid-up ships before wartime.

Regular personnel need preparation to take posts above their current responsibilities when wartime expansion begins. Reservists must train with those regulars and learn the particular ships they would help crew. A laid-up vessel can still provide access to its machinery, compartments, and working spaces even when it cannot be taken to sea. Funding that familiarization and reserve training is part of maintaining a usable fleet, rather than a cost that can wait until mobilization.