Missle Tank...
A Missle Tank is located where the SA-X was first seen- blasting her way out of a wall while you were riding down an elevator. All you have to do is get up around that area again, then run back two hatches until you get to an obstructive object requiring Morph Ball to squeeze through the space. Now run back, shooting the hatches, until your Speed Boost builds up, and keep running through the hole in the wall where the SA-X was- and you will blast through the wall into a Missle Tank!
More tricks, tips and cheats for this game are right here - Metriod Fusion cheats
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