Marine Base — Jet Stingray

Jet Stingray's stage, Marine Base, is a partly flooded undersea facility. Underwater movement is slower and floatier, torpedo turrets line several corridors, and the stage breaks up with a fast Ride Chaser (bike) section. Clear turrets from range before swimming through.

Near the end of Area 1 the Heart Tank sits on the ground floor. Stay on the lower level — don't jump up to the higher platforms, or drop back down to it if you already have.

One of the game's two Sub Tanks. During the bike section, take the upper route of blocks and launch a running long jump off the first big ramp to land on the platform where it sits.