In the room where it seems like you need them, there is a box you can destroy. Carefully jump on it (screw attack destroys it), get on the left side of it and jump up. You'll get in a secret tunnel around the power bomb block. You also need to use the same tunnel when going back, of course.
Yeah, you probably didn't, but there's still people who haven't finished the game, and don't want to know what happens at the end... and your first post pretty much gives away part of the ending.
And DZ, there was footage of Samus using or having power bombs before the game was even released, so we can probably let that one slide.
If you're talking about the footage of gravity-suited Samus space jumping around Crateria, you can actually see that if you leave the game at the title screen long enough. I really wouldn't call that a spoiler at all.
simply because i find it easier, i just get on the edge of the box and ibj myself to the top of the shat.
You find ibjing easier? You're either crazy, or REALLY good at ibjing.
well, on a 15% run, you don't have highjump (or at least i don't) and screw /spacejumping into that hole requires some sort of major precision that takes more time than if i just lined up underneath it and bombjumped up.... cause simply jumping from the top of the box doesn't reach all the way.... ...and i usually destroy the box trying to jump on it.
Ah, forgot about high jump. I suck so badly at bomb jumping I NEED to take high jump with me. I also suck badly enough at bob jumping that I find space jumping into that hole easier, but that's just me.
If the vid doesn't help, (And it might not because the button sequence is a little bit ambiguous) you need to jump straight up into the hole, and then, at the peak, quickly hold right and press A. You should go into a spin and Space Jump right before you fall back out of the hole. One Space Jump should be enough for you to grip the ledge. Also, note exactly where the tunnel leads out into, as in how far along the pipe it is. This will help later.