Well, you have to morph it into a ball and then keep going to your left and when you get to a wall (not hatch) use your bombs then blast your way to the top when you go through the hatch. Next use your bomb then go through the water where serris's skeleton. Then find a eye shooter thingy kill it then WAZAM your with serris.
When you get down to the spider , he will shoot fire and move arond so oyu have to move around too, if he moves left first go left too becasue he will not get you and throw you down, you can kill him by shooting missles into his mouth when he tries to shoot fire
Unlock Samus without her Helmet: Complete the game with at least 48% of the items collected and a time under three and a half hours.
Unlock Samus without her Suit: To see Samus Aran without her suit complete the game with ALL items (100%) and a time under 6:30. Or alternatively complete the game in under 2:00 with at least 50% of the items.
Some people think that at the end of the game, when you absorb the SA-X in it's parasitic form, you become the SA-X itself. Well folks, you don't. Use some logic.
When Samus absorbed the SA-X, she killed it, as opposed to changing into it. The SA-X is a parasitic being, an X parasite. Samus is part human, part Chozo, and part Metroid. Because she is a Metroid, she kills whatever X she absorbs.
Now, this rumor how you morph into the SA-X probably comes from the color change of your Gravity Suit after absorption. That happens because the SA-X has so much DNA and data to hold and keep straight, that it promtly infiltrated everthing- it reprogrammed Screw Attack, Space Jump, Speed Booster, High Jump, JumpBall, Power Beam, Spazer Laser Beam, Wave Beam, Morph Ball, Bomb, Power Bomb, Plasma Beam, Power Suit, and Varia suit. The Metroid half of Samus killed the X and applied the data to her Suit.