All scuba divers knows what a fishnado is. But in case you don’t know… It is a huge school of fish that drops down into a funnel like shape resembling a tornado and it makes us scuba divers very happy. Black Rock or Bajo Negro is famous for the fishnados there. Black Rock is one of our main advanced dive sites located in the Bat Islands area. No trip to Bats or Murcielagos is complete without visiting this site. Scuba Diving adventures in the Gulf of Papagayo, Costa Rica. Let your adventures begin.