Rikoriko Cave is the largest sea cave in the world. Around 15 million years ago an eruption formed a gas bubble that became Rikoriko Cave. It's large enough to fit at least 4 boats and makes for a great dive site.

Rikoriko Cave from the Outside

Rikoriko Cave from the Inside

There was much of the usual Poor Knights aquatic life in the cave but the biomass of blue maomao in the cave was really amazing. I've only ever seen this sort of thing in nature videos.

Biomass of Blue Maomao

Biomass of Blue Maomao

It was an amazing experience to just float into the centre of the biomass and be surrounded by the blue maomao.

Location: Poor Knights Islands, Northland, New Zealand

Dive Number:   151 Bottom Time: 54m Time In: 4:08 p.m. Tank In: Max Depth: 18.50 ft Table Used:

Mix:   Nitrox Safety Stop: 3m Time Out: 5:02 p.m. Tank Out: Average Depth: 10.60 ft Start Pressure Group:

Surface Interval:   2h 21m End Pressure Group:

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