CUREE approaching a coral reef biodiversity hotspot near a dendrogyra pillar coral. Photo by Yogesh Girdhar, ©Woods Hole Oceanographic Institution. Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. Coral reefs may soon have new swimming visitors observing their life-rich aquatic metropolises. But  that visitor isn’t a fish—or even a human. It’s an autonomous, multi-sensor survey robot . Developed by the Woods Hole Oceanographic Institution (WHOI) Reef Solutions Initiative , this new underwater surveyor uses a combination of hydrophones, high-resolution cameras, and an onboard computer to find signs of marine life hotspots. It then moves in closer for a better look, creating data-rich maps that would likely take many human divers multiple trips to produce. The system, appropriately called the Curious Underwater Robot for Ecosystem Exploration (CUREE), does all this all by itself. Well, that’s the goal, at least.…