Researchers have known that an animal swimming parallel to a solid surface receive a subsequent boost in performance, thus allowing them to utilise less energy when moving around. 

 

Studies have quantified this into a 25 percent increase in speed and a 45 percent increase in thrust when swimming near a solid surface. 

However, the jellyfish does not swim near the seafloor or seawalls. How does it get named the "world's most efficient swimmer"?

Apparently, it does so by creating a "virtual wall."

Because DCS isn’t the most straightforward diving injury, myths and misconceptions about it tend to arise. DAN is committed to continually educating divers about it, and we’ve decided to clarify a few of the most common misconceptions about it to ensure that all divers are better able to recognize DCS, respond to it and get the treatment they need in time.

While the most exotic of these potentially dangerous organisms are fairly well known, the more mundane sometimes cause uncertainty. Know what’s most likely to cause an injury on your next dive so you can relax and enjoy making bubbles.

In part one of this two-part series we’ll refresh your knowledge of wound care and treating common marine stings; next month we’ll cover injuries that involve scrapes, bites and penetrating wounds.