Planting corals is teamwork. One diver cuts the packages of the two components of the glue, a second mixes them, the third diver places the glue on the concrete blocks and the 4 one places the coral pieces. This takes place at a depth of about 8 to 11 meters, so that the divers can usually work for one hour until the air ends. Of course this means the available air above 50 bar, the 50 bar reserve should still be in the tank when we showed up. Safety comes first here too.
My video is at DLive