Once the tunnels were in place and the tanks filled to test for leaks (none were found) a seascape of caves and reefs was created using concrete before the basins were filled in one section with a careful selection of more than 1,800 marine creatures. Another section was filled with sharks (including bronze whaler, sevengill shark, wobbegong, school shark) and stingrays. The sharks are only held for a short period of time before being released back into the area where they were.