evidence: As you can see on the above satellite image, the Minerva Reefs are on a major under ocean ridge line. They are a couple of coral lagoon with almost nothing above the water at high tide and a substantial wall of coral deadening the ocean swell at low tide. [...] Both North and South Minerva Reefs lagoons has a small break in the coral wall to allow a boat to access. The access passages into the lagoons are not big, so daylight is essential to make sure I do not add Logic to the numerous boat that have been wreck on the reefs. North Minerva Reef has a more substantial coral rim to the lagoon, which makes it a better protected anchorage from the ocean swell. We ended up being able to make it into South Minerva Reef’s lagoon, in daylight, which would have not been the case if we had of continued the additional 24miles to North Minerva.I took the boat into the western lee of the island to try and catch a fish as we motored around to the entry of the lagoon. Which proved to be an ideal call as we caught a 4kg Big Eye Tuna, the Rolls Royce of sashimi tuna species.Compared to the coral reefs I had anchored in amongst , in the Great Barrier Reef, off the Australian coast, it was relatively easy to entre to South Minerva Reef’s lagoon, but I still would not have liked to do it without daylight to confirm there were no coral bommies in our path.