So I finally got stuck. I'm pretty sure the next step for me is to get to the Ghost Ship since that's where you get the grappling beam (right?) but I can't get into that area since I'm trying to access it through the left path off your mother ship (when the game starts) and I'm stuck in that room where there's a single rocket upgrade in a pillar with water surrounding it. Do I have to find a way to get into the Ghost Ship through the elevator in Maridia?
Two techniques without the Grappling Beam:
http://www.youtube.com/watch?v=5KXlcEJLNUo
and
http://www.youtube.com/watch?v=4qaeSaTXAf4