Still A Mystery

One of the crew member named Håkan Larsson described the scene on his blog. He wrote “We left Neiafu and Vava’u yesterday after some tedious checking out procedures and set sail for Fiji, passing the north side of Late island as first way point. After five miles we noticed brown, somewhat grainy streaks in the water. First we thought that it might be an old oil dumping. Some ship cleaning its tanks. But the streak became larger and more frequent after a while, and there were rocklike brownish things the size of a fist floating in the sea. And the water were strangely green and “lagoon like” too.” What could it be?