Deep underground, in submerged caves, there is no light. Because there is no light, there is almost nothing for animals to eat. Yet life survives here. The top predator in these sunless ecosystems is a tiny blind cavefish, only a few inches long. These fish are extremely rare, only found in the dark recesses of caves. Jonathan joins Christine Loew, a veteran cave explorer, on a mission to film this elusive fish in Mexico’s Riviera Maya.
