Did this site 4 different times in a one week trip. The morning dives all had 100+ viz and the afternoon dives closed down to about 50 feet. Both lava tubes are great to explore. Lots of turtles and eels, plenty of fish. No need to go out past the two mooring bouys [most of the sights are from 30-50 feet]. Make sure you enter in the little cove instead of on the lava shelf. One of the best sites on the Big Island.