A huge underwater volcanic eruption off the Japanese island of Okinawa has left a build-up of pumice stone along the coast.
Swimming Through Pumice Stone After Underwater Volcanic Eruption | BBC News
By rokur
rokur
Production engineer and certified swim coach. Full-time IT consultant, spare-time swimming aficionado. 2 sons, 2 daughters and a wife. President of the Faroe Islands Aquatics Federation. Likes to run :-)