It's good to know people don't always torture sharks and sharks don't always torture people. Sometimes, we even help each other out.

David Blyde, a veterinarian in Australia, was willing to plunge his arm up to his shoulder into the throat of a 10-foot nurse shark to save the animal after it swallowed a large hook. It was stuck in the animal's digestive tract, leaving a long metal handle sticking from its mouth, AP reports.

The gray nurse shark is apparently one of Australia's most endangered marine species because it was fished to near-extinction, with some estimates running as low a fewer than 300 animals left in the wild in waters off Australia's east coast.

I wrote about nurse sharks just last week. In Belize, you can swim with them and pet them. The Australian grey nurse shark is a little different than the kind they have in Belize. Still, it is generally much smaller than the more aggressive great white. It is also not considered a threat to humans, but its bite could still do serious damage.

The "hooked shark" was spotted by divers on Monday as it swam with a group of others near Byron Bay, 500 miles north of Sydney. After the animal was captured and placed in a holding tank, rescuers pushed a stiff plastic pipe into the shark's throat. Blyde then reach down through the pipe to free the hook.

Blyde told reporters that "as a veterinarian you often end up putting your hands in places that people find somewhat unattractive."

I think I could think of several different professions with the same problem.

Greetings from Belize.

Yesterday, I made one of my life-long dreams come true. I dove the Great Blue Hole, a submarine cave about 45 miles off the coast of Belize. They say after diving it, divers are usually either utterly disappointed or absolutely blown away. I found it absolutely amazing.

The Great Blue Hole is circular, over 1,000 feet (330 meters) across and 400 feet (120 meters) deep. It was formed as a limestone cave system during the last ice age. As the ocean began to rise again, the caves flooded, and the roof collapsed.

The trip

To get to the Blue Hole, we booked a diving with the operator Aqua Dives Belize. They offer a $199 per person special now, which was the cheapest deal going, from what I could see. It includes the boat trip out there, breakfast, lunch (on a tiny caye on the same atoll) plus yummy rum punch (after diving), purified drinking water, 3 tanks and weight belts.

(We'd tried Ambergris Divers earlier, and found their staff friendly and competent, but we preferred Aqua Dives and their newer equipment.)

You start out at 5:30am, and make a 3-hour boat ride from Ambergris Caye to Lighthouse Reef. After a total of three dives, they get you back at 5:30pm.

Hello from Belize! What a beautiful little country this is.

I have wanted to come here forever, being a diver and all. As you probably know, the Belize Barrier Reef (stretching from Yucatan all the way to the coast of Guatemala) is the second largest reef in the world, after the Great Barrier Reef.

We took our first dive trip today, right off the Ambergris Caye island. It was just a shallow dive with a bunch of snorkelers who desperately wanted to "see some sharks." This part of the reef is know for its abundance of nurse sharks, pretty harmless types of sharks who eat by suction (hence the name). Still, they are sharks, aka beautiful creatures.

The dive instructor threw in some bait (an enormous fish head) and a few minutes later, a bunch of sharks (I saw five, the largest at least two meters long) and sting rays (the largest was over a meter across) came by for the feast. It was an incredible sight.

I don't know how I feel about the whole "petting the shark and sting ray" aspect of the whole thing. The instructors caught a couple of the sharks by the fin and let everyone in the group touch them. Same with the sting rays. I felt a little bad for them. I can't be good for them to have a hundred people a day touch them, right?

Check out this amazing photo. Two times a year in the late spring and late autumn, up to 10,000 Cownose stingrays make their way between their feeding grounds in western Florida and the Yucatan Peninsula in the Gulf of Mexico. This amazing shot of the migration was taken by amateur photographer Sandra Critelli.

As soon as I saw Sandra's image, I immediately wanted to know where it was taken. According to some quick research, she apparently encountered this awesome phenomenon while on a Whale Shark expedition off the coast of a small Mexican island in the Yucatan called Holbox. As intrigued as I am by her photo, my interest was instantly piqued by the mention of whale sharks - huge, plankton-feeding fish that can grow up to 40 feet in length. Holbox is apparently whale shark paradise, hosting numerous opportunities to dive with huge creatures.

Between huge schools of stingrays, giant whale sharks and plenty of other sea life at diving hotspots like Cozumel, the Yucatan peninsula is a diver's dream.

They had been married for exactly 11 days and the husband already wanted to kill his wife? When they say everything happens faster nowadays, they are not kidding.

Yesterday, four and a half years after the Gabe and Gina Watson incident, a warrant was issued for Gabe. Australia has asked for his extradition from the US to stand trial for killing his young wife while diving in an apparent attempt to secure her life insurance payout, The Guardian reports.

The US newlyweds were on their honeymoon. Gabe Watson, an experienced rescue diver, was exploring a submerged wreck with his wife when she died. It was her first big diving trip, after she had been persuaded by her husband to explore the deep, turquoise waters of the Great Barrier Reef.

One witness said the couple appeared to be locked in an unnatural embrace at a depth of about 50ft before they separated, with Watson heading to the surface while his wife sank to the ocean floor. A leader of the dive spotted the stricken woman and brought her to the surface, but she could not be revived.

Gabe, however, severely underestimated the prevalence of underwater cameras these days. A couple people in their group just happened to take some revealing pictures (and videos) of the scene...

One for the scrapbook.

Travel health and the emerging specialty of "wilderness medicine" have obvious overlap. Dr. Paul Auerbach is one of the leaders in wilderness medicine: helping found the Wilderness Medical Society, co-author of A Field Guide to Wilderness Medicine and numerous journal articles and serving as faculty to the Stanford Fellowship in Wilderness Medicine.

His blog, Medicine for the Outdoors, is celebrating the two year anniversary. For those who haven't yet had a chance to visit, it is filled with practical information and advice for those exploring their environment and wanting to come back from the experience in good health. Travel and expedition medicine is the focus of my career and I find myself citing Dr. Auerbach's work and information, in my work. He is one of the pioneering physicians who helped elevate this field of medicine to a new and unique specialty.

A visit to his blog will allow the reader to learn about things from jellyfish stings and dislocated shoulders on the trail to malaria medications and outdoor recreation. This is truly an opportunity to read, first hand, the information from a leader in wilderness and expedition medicine. I highly recommend a visit to his blog, if you get a chance. Oh, and don't forget to congratulate him on his two-years of dispensing great advice!

I think I just figured out where I want to be buried when I die. Check out this underwater cemetery, which opened last fall about about 3 miles off the coast of Key Biscayne.

The Neptune Memorial Reef was built as the "perfect final resting spot for those who loved the sea", AP reports. Its creators hope that one day the reef will cover 16 acres and have room for 125,000 remains. The artificial reef's first phase allows for about 850 remains.

In March, the remains of 93-year-old diver Bert Kilbride - who called himself "The Last Pirate of the Caribbean" - were placed atop a column of the reef's main gate, because of his contributions to the sea. Kilbride was named the oldest living scuba diver in this year's Guinness Book of World Records.

I have to tell my Mom about this guy. She might appreciate that he made it to the age of 93, being a diver and all. A fortune-teller once told her that "danger awaits me in the water." Ever since then, she expects I'll get eaten by a shark every time I dive. How cool would it be to get eaten by a shark after you are already dead a buried? I can't wait to tell my Mom about it. Tomorrow. I don't think she would appreciate the sentiment on Mother's Day.

Happy Mother's Day!

[via ABC News]

If you are in the midst of planning a beach vacation, this is bad timing. I was just about to tell you about the World's Most Dangerous Beaches, as compiled by Forbes.

In 2006 alone, American households apparently took nearly 55 million trips to the beach. Most of those trips were totally safe and pleasant. The rest of them....not so much.

Here are the World's Most Dangerous Beaches by Forbes:

• Shark Attacks/Bites: New Smyrna Beach, Volusia County, Fla., Runner Up: Hawaii
• Pollution: Hacks Point Beach, Kent County, Md./Beachwood Beach West, Ocean County, N.J.
• Jellyfish Attacks: Northern Australia
• Rip Current Drowning: Brevard County, Fla., Runner Up: Volusia County, Fla.
• Boating Accidents: Florida, Runner Up: California
• Lightning: Florida, Runner up: Colorado

Umm, Colorado? They have beaches in Colorado?

P.S. Is it just me or is this list a little US-centric?

The Great White Shark attack off the coast of San Diego yesterday (and Mark Shaw's insightful comments about it) got me thinking about wetsuits. Doesn't it seem that most shark attacks happen because sharks confuse swimmers or surfers with seals? (See photo to get an idea of what such lovely encounters might look like.)

Here is my question. Why are most wetsuits black then? The majority of the all wetsuits I have ever rented and worn for diving have been black; hence they make you look like a seal. They might have a few color accents, but I am not sure the vision of sharks is good enough to fully appreciate them.

The guy who died in 2004 after a shark attack in Northern California was wearing an olive camouflage wetsuit that made him blend into the rocks (and possibly look more like a dolphin than a seal. Sharks like dolphins, too.) This page has a lot of interesting information about that attack.

Some sources, the surfing handbook being one of them, say the wetsuits with big color contrasts make you look like a fish, which is apparently not helpful, either. I have to say, I have never seen a 6-foot fish of crazy colors though.

Is it difficult to dye neoprene, say, all white or all orange? Would that help or is that wishful thinking?

If you've ever had a desire to learn underwater basket weaving, you might first want to start with underwater ironing. As much as this sounds like an April Fools post, 72 Australian scuba divers did in fact break the world record for what they call "extreme ironing" when they dove into the water just south of Melbourne accompanied by their linens and ironing boards.

What exactly is extreme ironing? It's the "latest danger sport that combines the thrill of an extreme outdoor activity with the satisfaction of a well pressed shirt," according to the sport's official website, the Extreme Ironing Bureau. Extreme ironers don't only press their shirts underwater; the sport can take place anywhere, from a mountainside to in a canoe, all around the world.

Still confused? Check out the Extreme Ironing Bureau's FAQ section and I am sure that all of your questions will be answered and by that point you too will be ready to add the extreme sport to your list.