If you are traveling in the open ocean, it is undoubtedly the reason that the medium you would expect to travel mostly is water. You don't have to be Jessica Watson to know this. For the most part, you would expect to peek over the railings and stare at the deep, mystifying blue of the ocean. You wouldn't expect to see, say, a whole bunch of rocks. This shows that something went very wrong
This is the view that greeted Shannon Lenz while traveling near Wawa in Tonga. As you can see from the about 50 second marking of the video below, Lenz is heading towards a surreal landscape of floating rocks, rolling slightly with swell:
It turns out that these rocks were thrown to the surface by an underwater eruption of a volcano near Tonga. The eruption created a "pumice stone" raft, which is essentially hardened lava that is so porous and full of gas that it floats.
The same raft is also encountered by sailors Michael and Larissa Hoult who described the phenomenon on Facebook as " a complete rock gap made of marble pumice [marble pumice]. ". The raft forced them to slow down drastically, and at one point forced them to stop after a pumice stone caught between their rudder and the hull of the ship hit their steering wheel.
Despite these failures, they seem quite concerned about the experience: [1
In the photo: Hiking Hooked Search engine. (Source: Facebook.)
Salt covers an area of about 150 square kilometers, which is approximately three times the size of Manhattan and is apparently large enough to be very, very visible via satellite.