French company #Seabike has developed a swimming device that uses your own leg power to accelerate you through the water at superhuman speeds.
This crank-driven pusher prop looks a bit like an #underwater#unicycle...
The idea is simple enough; you extend the Seabike's pole to the appropriate length, then strap it to your waist with a belt. Then you find the pedals with your feet, and start turning the crank, with the waist strap to push against. https://newatlas.com/marine/seabike-swimming-propeller/
A team of scientists and Alaska Native community members explore the continental shelf west of Prince of Wales Island in southeast Alaska, seeking submerged caves and rock shelters that would have been used by early inhabitants.
It's always disappointing to see invasive lionfish on Caribbean dive sites, as they devour the local populations and have few predators. That said, they are visually interesting, with so many different colors and textures warning predators about the venomous spines.
Yellowhead jawfish are one of my favorite creatures to photograph, but they take a lot of patience. They are often quite cautious and will retreat into their burrows, but if you give them some space and remain calm they will sometimes come out and take a look.
Flamingo Tongues (the name of this snail) are fun to photograph and look at, but they are a menace to soft corals, secreting chemicals to dissolve the coral so they can digest it. They often leave a trail of destruction behind them as in this image. The snail is moving upward to devour more polyps.