For British photographer Tom St. George, diving is escape. But when he plunged into this underwater cave in Tulum, Mexico last month, he found himself on another planet entirely. Runoff stained with tannins from the forest had dyed the normally clear water a surreal, Martian shade of red. "It really did feel like being in outer space," he says The cave he visited is the Aktun Ha cenote, a submerged sinkhole people also call the "carwash" because taxi drivers once scrubbed their cabs there.

The latest in-depth coverage covering the intersection of technology and culture. WIRED’s award-winning journalism will help you make sense of a world in constant transformation. Join us as we explore the ways technology is changing our lives.