Don’t let the name scare you away: the dive will have you gliding along healthy and vibrant coral reefs off the rocks of Grande Soeur Island (Big Sister Island). Maximum depth 26 meters (85 ft), 30 minutes from the center.  Don’t let the name scare you away: the dive will have you gliding along healthy and vibrant coral reefs off the rocks of Grande Soeur Island (Big Sister Island). Maximum depth 26 meters (85 ft), 30 minutes from the center.