Early Sanctuary Fortress
From M2K2: Metroid Prime 2 Wiki
Use the "Kip Dash" or the L dash to get to Sanctuary Fortress Early.
Go through all of the paths until you reach a dead end in Sanctuary Fortress. Simply switch to Morph Ball mode and roll into the Spinner. There you go! You're stuck and you have no way out, because you don't have the Morph Ball Bombs yet! ATTENTION: A video would be nice THANK YOU : )