Recent news reports about scuba divers off San Diego being menaced by large numbers of Humboldt's or jumbo squid have raised the ire of University of Rhode Island biologist Brad Seibel. As a leading expert on the species who has dived with them several times, he calls the reports "alarmist" and says the squid's man-eating reputation is seriously overblown.

As you go about your day-to-day activities, tiny bubbles of nitrogen come and go inside your tissues. This is not a problem unless you happen to experience large changes in ambient pressure, such as those encountered by scuba divers and astronauts. During large, fast pressure drops, these bubbles can grow and lead to decompression sickness, popularly known as "the bends."

There's a reason so many divers are obsessed with wreck diving! Shipwrecks are mysterious and exciting, and encountering one on the ocean floor lends a diver an almost indefineable sense of discovery. Shipwrecks can be beautiful and horrifying at the same time, and wreck diving  is often a very evocative and emotional experience. If you feel that it's time to add a new dimension to your diving, to try something a bit more challenging, and wreck diving might be just what you are looking for.

The Great barracuda is amongst the top predators in their environment and use very highly developed smell and vision senses to locate their prey. When attacking, the barracuda will charge at fast speed (approximately 12 ms^-1) and ram their target. They then unleash the power of their jaws which allows them to slice through their prey, even those larger than the barracuda itself. The jaw of the barracuda is formed in such a way that the upper and lower jaws form ‘rows’ of teeth. The top jaw has smaller serrated teeth on the outside and larger canines on the inside, and the teeth of the lower jaw fit between them when the mouth is shut. When the jaw closes this acts like scissors and slices through prey with ease.

Researchers find overwhelming evidence that applying hot packs or immersing in hot water is much better for treating jellyfish stings than cold water which was previously widely recommended.

Jellyfish stings are responsible for more deaths than shark attacks each year. Even “mild” stings can hurt for hours to days and leave lasting scars. According to some estimates, more than 150 million people are stung by jellyfish each year.