Coral reef with white sand bottom.
Knelt on sand to retrieve carabiner and felt sharp pain in right knee. Patrick said that puncture marks indicate sea urchin and advised treatment with hot towel. Pain subsided after 2 hours. Did not do 5th dive with Rick.
As there was no swelling and no nausea or dizziness, continued to dive and surfaced with group.
Found droplets of water in S100 housing.
Sightings of macro life like Pygmy pipehorse nudibranchs and orang hutan crab