The Gravity Suit is the second suit upgrade Samus acquires on Tallon IV. In Metroid Prime, the Gravity Suit allows Samus to move and jump unhindered while underwater, making it essential for exploring areas like the crashed Frigate Orpheon. It also reduces the damage she takes by an additional 10% and improves her vision underwater.
The Gravity Suit can be found in a room aptly named the Gravity Chamber in Phendrana Drifts.