Dave Ross captured this video during Mini Lobster Season 2009.
Lobster Mini Season 2009
The Hydro Atlantic is one of South Florida’s most popular technical wrecks. It sank during a storm in 1987, is 300 feet long and lies at 170 fsw. This four minute movie was made on 26-Aug-2007 as open-circuit technical divers toured the wreck from the bow to the skylights. The divers entered the engine room through a skylight, went down into one of the ships holds, then continued back to the anchor line at the bow.
The Z2X may be the least expensive of the Atomic line, but its combination of performance, ergonomics and materials are unmatched by our competitors at any price. The Z2X is an exceptional value, offering many of the exclusive Atomic performance features and innovations, and materials. Standard with AFC automatic flow control, Seat Saving Orifice and Comfort Swivel Hose.
Some objects, when placed in water, float, while others sink, and still others neither float nor sink. This is a function of buoyancy. We call objects that float, positively buoyant. Objects that sink are called negatively buoyant. We refer to object that neither float nor sink as neutrally buoyant.
The idea of buoyancy was summed up by Archimedes, a Greek mathematician, in what is known as Archimedes Principle: Any object, wholly or partly immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object.
From this principle, we can see that whether an object floats or sinks, is based on not only its weight, but also the amount of water it displaces. That is why a very heavy ocean liner can float. It displaces a large amount of water.
Archimedes principle works for any fluid, but as divers we are mainly concerned with two different fluids: fresh water, and salt water. We need to think of fresh water and salt water as two different fluids because equal volumes of fresh water and salt water do not weigh the same. For example, a cubic foot of fresh water weighs approximately 62.4 lbs, while a cubic foot of salt water weighs approximately 64 lbs. The extra weight is because of the dissolved minerals in salt water.
Let’s take a moment and look at an object in water and Archimedes Principle. If you place a 1 cubic foot object that weighs 63 lbs into fresh water, the object is displacing 62.4 lbs of water, but weighs 63 lbs. This object will be negatively buoyant – it will sink. It is however being buoyed up with a force of 62.4 lbs, so if we weighed it in the water it would only weigh .6 lbs.
Diving in the Bahamas 2008