Go deep, stay long

It certainly has been difficult to get out diving this fall. However, the few times we were able sneak out, the diving was fantastic. This Sunday we headed out to the Resor with a jam packed boat. Clearing the inlet we had nearly flat seas, and just a breath of a breeze. With the early start, the sun was just rising. We all kept our fingers crossed that the conditions would hold, since NOAA was calling for the wind to pick up a bit in the afternoon.

By the time we reached the wreck, the sun was a bit higher in the sky, and the conditions were still flat. The surface water was a nice Caribbean blue. Dropping down the line it was clear that there was a good current to the east. This made going a bit slow, but we were soon tied in.

While working with the line, shadowy figures kept appearing in the distance. At first I thought the dogfish were back, but it turned out to be bluefish. We saw them inshore last week. Now there was a school buzzing around us on the Resor. Ever few minutes a few of them would dart by. Down on the sand, there were large fluke and flounder almost side by side. Normally we see one or the other, but here the flounder were hunting while the fluke were resting. Both scurried off when approached. Large tog are always around this wreck, and this was no exception. I spotted a few small lobsters, and one good size one with eggs.

I was nearing my turn time when I spotted a nice new Danforth with a long chain. At least I was not going up empty handed. It turns out that the current and the wind were not aligned, and I spent my deco holding my reel in one hand (attached to the Danforth and lift bag) and the shot line in the other. I was just hoping other divers would not get caught in the line.

My hunting efforts had been thwarted, but many others came up with lobster, tog and some nice size pollack. There were various reports of giant lobsters, deep in the wreck, well out of reach. A few folks had ventured out into the sand for scallops, with varying degrees of success.

All in all it was a great day of diving with 30-40 ft of vis and 65 degrees top to bottom. The wind had picked up as we started to head in, but it was still a comfortable ride home.

The Lockness stopped by

Saturday, Divers Den North had a charter to the Stolt. Everybody loves this wreck. The drive out was spent weaving and dodging the flotilla of recreational boats. Apparently there was a fluke tournament, and the masses had turned out.

When we reached the Stolt, Terry jumped in to set the hook.  Watching him descend, it was obvious that surface vis looked much better than the week before.  However, when we pulled up a dragger had passed very close to the wreck.  This raised concerns about the vis on the bottom. Terry had us tied in quickly, and the pool was open.  As divers were rolling in, the Lockness arrived from Long Island, and asked to join us.  Before long they were tied in, with their boat just off our stern.  Captain Dan seems to know everyone.  We were soon exchanging stories of dives, trips, and artifacts.

Divers started returning with bags of scallops, bugs and mussels. A couple of nice tog came up also. From the reports the temperatures had not changed much, but the visibility was just the opposite. of last week. It was clear on the surface, and only 10 feet or so on the wreck.

I rolled in with a student, and we headed for the bottom right along the break. The reports were accurate, the vis was bad, with some surge at the top of the wreck, and current past the hull. We did a quick tour of the break, then headed slowly up the super structure. We poked our heads in a few holes, but the vis was just as bad inside. One interesting observation was the number of scallops on top of the wreck, and on the flat surface of the superstructure.

The Coast Guard takes over the escort

While we were in the water, a boat in distress was reported in our area. We got underway quickly, and sped off to assist. Upon arrival, we could see that the boat was low in the water, but they had stopped taking on water. We escorted them toward shore until the Coast Guard arrived on scene. Nothing like a little drama on the high seas.

Many people see my dive gear, and ask “What newfangled contraptions is that”? Ok, maybe they don’t use the word “newfangled”, but you get the point. I dive a Closed Circuit Rebreather (aka CCR). While people think of these as “new”, they actually predate the gear we consider standard SCUBA (also called Open Circuit or OC).

History: Early rebreathers were used not for diving, but for escape. Mines and Submarines both presented situations where a compact breathing device was needed to allow crews to escape to safety. Theses were developed back in the early 1900, and produced in quantity by 1910. Open Circuit SCUBA was not commercially available until the mid 1940s.

How do they work: Let’s start with a quick review of metabolism. Our cells take in food and Oxygen (O2). These are combined to produce energy, but have a toxic byproduct of Carbon Dioxide (CO2). Our Cardiopulmonary system takes some of the O2 from the air we breath, and distributes it to our cells. At the same time it takes the CO2 generated by our cells, and releases it into the air that we exhale. The O2 and CO2 exchanged by our lungs is actually a small percentage of the volume of gas that we breath (about 3%-5%).

On Open Circuit, when a diver inhales, the regulator provides the diver with gas (usually air) at same pressure as the surrounding water. When we exhale, the gas is vented out into the water producing the column of bubbles associated with diving.

When a CCR diver exhales, the gas is vented into a flexible chamber called a counter lung. Within the Rebreather, O2 is added back into the gas, and it is passed through a “scrubber” which removes the CO2. We then inhale the same gas which again contains the proper O2 percentage.

With OC 95% of the gas we exhale has not been affected by our respiration. It is not used. It is wasted. On CCR, this 95% is recycled, cleaned of CO2, enriched with O2, and breathed again. This allows us to make use of smaller tanks, as our O2 consumption does not change with depth.