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The rocky cave consists of an uneven horizontal tunnel, with a pair of natural rocky shafts extending downward on the left and right sides. The rocky cave is found directly to the left of Samus Aran's Gunship, and proves to be essential in traveling between Crateria's landing site, Tourian's escape shaft, and Brinstar's Corridor No. 1.
During Samus Aran's Zero Mission, the rocky cave is completely uninhabited. It is implied that Samus first passes through here while monologuing during the game's introduction, although this walk would occur when the screen fades to black and therefore is not visually seen. Her first passage through the rocky cave is suggested by the room's right shaft leading directly to the Starting Point of Corridor No. 1, where the screen fades back into view with Samus already in it, marking the start of her mission.
Samus later returns to the rocky cave through the lower left corner while escaping the imminent destruction of Tourian. She ascends the left shaft and has to break several barriers with her Beam to reach the landing site. During this time, a cave-in has occurred in the lower right shaft, with boulders now blocking its passage. After receiving the Fully Powered Suit in Chozodia, Samus can return to the rocky cave to access the ruins of Tourian. She can also break through the aforementioned boulders with a Power Bomb to return to Corridor No. 1.
The rocky cave plays a much greater role during the Raid on Planet Zebes in Super Metroid, and is the first room Samus enters after landing her ship on Zebes. At first, the rocky cave appears desolate, with only a few Sbugs that are spooked by Samus's presence. Starting with only her basic Power Beam, Samus can only access two Blue Doors at first (with one leading quickly to a dead end), but many more paths and doors quickly open up to her as she acquires her Morph Ball, Missiles, and Bombs. After returning to the rocky cave from the ruins of old Tourian and Brinstar, she finds the tunnels swarming with Geemers, Rippers, and Skrees.
Just like in Zero Mission, Samus's escape from the exploding Tourian in Super Metroid brings her through the rocky cave, which is now uninhabited once again. She has the option to detour through the right shaft to rescue the Etecoons and Dachora before returning to the landing site.
- Landing Site (via Blue Door)
- "Transport to Tourian" (via Green Hatch)
- "Weed-filled hall" (via Blue Door)
- Landing Site (via Blue Door)
- "Tourian escape shaft" (via Blue Door)
- "Crateria Save Station" (via Blue Door)
- "Final Missile Bombway" (via Blue Door)
- "Pre-Map Flyway" (via Red Hatch)
- "Flyway" (via Blue Door)
- "Fungal slope" (via Blue Door)
- 210 CLIMB AND CONQUER (pg. 76)
- "After you emerge from the shaft, you'll still have a good distance to cover before you're free and clear. Jump onto the planet's natural ledges to reach the surface level, then blast through a series of walls as you run to the right."
- 276 RETURN TO TOURIAN (pg. 89)
- "Your item-collecting travels will take you to Tourian next. Run left, blasting barriers as you go, then drop through a long natural shaft and use a Super Missile to break through a green hatch. Continue left to the Tourian elevator."
- 281 BEGIN AGAIN (pg. 91)
- "Climb up the rock shaft, move right and detonate a Power Bomb at the reddish boulders. You'll carve a path to Brinstar - where you started your adventure."
- Much like Crateria itself, the rocky cave did not appear in the original Metroid but was included in the Zero Mission remake, strengthening its continuity with Super Metroid.
- In Zero Mission, if the Green Hatch just outside the Tourian elevator is opened with a Super Missile during the escape sequence, the hatch will remain green until opened again. Only then will it remain blue.