Researchers to probe undersea ‘blue hole’ off Florida: report

The video explores the Green Banana, a massive undersea cavern off Florida's coast. Managed by NOAA, this year-long expedition investigates the blue hole, an oceanic sinkhole equivalent, estimated to be 425 feet deep. Due to its narrowness, divers, not drones, will explore it. Blue holes may host diverse marine life, including sea turtles, corals, sponges, and sharks, in otherwise barren ocean regions.

Why might divers need to investigate the cave system instead of using drone submarines?

What types of creatures are mentioned as potentially living in blue holes?