Clean Up and Snorkel

Today is the day I prepare for my mom and sister's visit. I'm straightening all the books, arranging the movies, hiding the my video games section so it doesn't 'disappear' after my mom sees them ;-), vacuum the floor, clean up papers, collapse cardboard boxes for storage, arrange my dresser surface, and make sure all my clothes are properly folded. In short - everything I should have done for myself already! Except for the hiding of the computer games.

I went snorkelling for four hours today (2000 Calories), and I was pleasantly shocked and surprised to see snorkelling on the shapefit.com site I mentioned yesterday. You know it has everything when it has a listing for horse grooming. Let's see... pogo stick... pogo stick... pogo stick... no. Doesn't have quite everything. Maybe I'll E-mail and request to have it added.

I tried out a new snorkel today. I bought the snorkel so my sister would have something to use when we go swimming. The new snorkel has a feature where a tab will keep water from coming in once I enter the water. The only problems with that feature is that as I go 30, 50 feet down, the water is trying to press into the snorkel and the only flexible entrance to the snorkel is my mouth. So as I go down, I not only need to equalize pressure in my mask to prevent mask squeeze, I also need to equalize the pressure in the snorkel to prevent, ah, snorkel squeeze? The short story? The new snorkel removes useful air from my lungs to use in the snorkel. Fortunately, after my intake of air going down, I can just remove the snorkel from my mouth and not worry about it. Problem solved!

Snorkeling or Snorkelling

I went snorkeling ( spelling can also be snorkelling ) at Blue Springs this weekend and found it to be a blast! When I was doing my training dives, I did some snorkelling then, but with the wetsuit, I could barely go 15 feet. Without the wetsuit, it was quite easy to dive down deep. In fact, I go lower than I did scuba diving. 60 feet down to be exact. Getting down that far though didn't give any time to look around though, so usually I tried to hang out about 50 feet. There were some rock ledges that I could hold onto so I didn't start floating up. There really isn't much to see at that depth other than the rock formations the spring carves.

If I ever go snorkeling with a scuba diving buddy, I want to try a cave that is thirty feet down. I don't know how long it is, but it took the scuba instructors about 3o seconds to do it with scuba equipment. At only thirty feet down, I figure a 30 second jaunt through the cave is definitely doable, but I would want someone to be able to rescue me if I didn't come out!

For those of you who thing snorkeling might be fun - some warnings.

1. Don't hyperventilate to hold your breath longer and stay under. Hyperventilating fools your body into thinking there is more oxygen than there really is. When you reach the point that 11 percent of the air in your lungs is oxygen, your body realizes that it got out of sync with your brain, so it knocks you out so you don't keep trying to do crazy stuff like hold your breath too long: unfortunately for you, you're underwater at that point, and the body's technique fails. This usually happens about 15 feet, because divers tend to cut the dive close, and 15 feet is where your brain and body happen to catch up.
2. Don't accept air from a scuba diver. The air at 60 feet down is under 3 atmospheres. If you hold your breath at all coming up, your lung can be damaged from expanding air. While scuba diving, we're told not to hold our air at all, because even while we're floating, waves on the surface can be changing our effective pressure. Even 4 foot differences is enough for small damage. It takes years for that much to be a problem, but snorkelers can cover 15 coming up within a second. (The rate you rise continues to increase as you float towards the surface)
3. For the same reason as number two, don't use air pockets you find underwater. The cave I want to dive through has an air pocket. If desperate, I would use it, but then again, I already know what to do if I'm rising to the surface with compressed air in my lungs (blow small bubbles out constantly.) This year, a kid had a problem because he used that air pocket at blue springs and didn't know what scuba divers know.

There are some advantages that you get while snorkeling, that you don't get above the surface. When you put your face under the surface, a few survival features your body has kicks into gear

1. Bradycardia - a 20 percent drop in heart rate occurs while under water - nice!
2. Vasoconstriction - your blood vessels start supplying the vital parts of your body by constricting the vessels in your arms and legs. If you're in and emergency and in cold water a long time, this can save your life (at the cost of your appendiges possibly.) While snorkeling, it just means your oxygen consumption drops.
3. Splenic contraction - One function of your spleen is to hold oxygenated red blood cells in reserve until needed. Diving underwater triggers this mechanism and boom! You have even more oxygen saturated blood cells than you did before! Apparently in seals, the spleen has been seen to contract to 16% of it's original size. I have no idea how much contraction occurs in humans
4. Blood shift - occurs because of the pressure drop. blood plasma fills up the vessels in the lungs to reduce volume. This keeps your lungs from collapsing in on itself at depths greater than 30 feet. Doesn't help you stay under longer, but it does mean you can have a fun experience if you go beneath 30 feet!
   

That is all folks! Hope it was an informative lesson on snorkeling. If you have any questions, just ask in comments. I'm sure Wikipedia also has something very informative and better arranged than my lists.

Fun fact: Umberto Peliazari's heart rate drops to 8 beats a minute while diving.