............It Might Be Too Late For ManKind.



What is Aquarius made of?

The external envelope (main body) of Aquarius is made of 3/4" thick steel. This is the pressure hull that divides the entry lock and main lock. A 3/8" thick layer of insulation is located on the outer hull of Aquarius.Aquarius consists of three main compartments: main lock, entry lock and wet porch. The two locks are part of the 33 foot long, 9 foot diameter steel tube. The wet porch is a 7 foot long x 10 foot wide by 8 foot high steel box. They connect together by watertight doors. The wet porch is open to the sea through its floor.

What things are taken into consideration when building such a structure?

First, where will the underwater laboratory operate? Water depth determines the thickness of the walls and viewports, the type of fittings for connections and plumbing, and much more. Depth also determines what kind of breathing gas system is required. Most people are surprised to learn that you can only breathe normal air down to a certain depth before it becomes toxic. Both nitrogen and oxygen cause problems when the pressure gets too high. Aquarius consists of more systems them just the underwater laboratory on the bottom. The habitat itself, when full of air, floats! Therefore, it is attached to a 120 ton baseplate that serves to anchor it to the bottom. There is also a buoy, called the LSB (Life Support Buoy, that is moored above Aquarius. The LSB contains generators (for power) and compressors (for air). The buoy is connected to the habitat by an umbilical - a set of wires and hoses wrapped together in aspecial protective cover. The buoy also has radios that can send signals from Aquarius to the mission control - over nine miles away in Key Largo, Florida. Another important consideration is related to want you want to accomplish using an underwater laboratory. In other words, why build an underwater habitat? In the past forty years, over sixty underwater laboratories were built, some were larger and some were smaller than Aquarius. Aquarius was designed to be more than just an underwater habitat for living. It is an underwater laboratory with wet and dry lab space, electrical and computer capabilities, and a comfortable iving space for six people that allows the scientists to focus on their research. The Aquarius program is less about what happens inside the underwater laboratory. Instead, the value of Aquarius is defined by the work scientists do outside Aquarius, on the reef and in the surrounding ocean. The Aquarius System The fully equipped underwater laboratory includes several components. The Aquarius "habitat" module is an 82-ton double-lock pressure vessel that measures approximately 14-meters long by 3-meters in diameter. Scientists live and work inside the habitat when they are not on excursions, diving outside on the reefs. Entry is through the 20-m3 wet porch, which contains an open moon pool, dive equipment storage areas, and hot water heater and shower. There are two main compartments in the Aquarius module. The 14-m3 "entry lock," contains bench space for computers and experiments, power equipment, life support controls, small viewports and bathroom facilities. The largest living space is the 40-m3 "main lock." It includes berths for the six-person crew, computer work stations, two large viewports, kitchen facilities that include a microwave, instant hot water dispenser, refrigerator, sink, and dining and work areas (Figure 4: low res/high res). The main lock also contains life support controls, so both the entry and main locks can be independently pressurized. The Aquarius baseplate is a 116-ton structure that provides a stable and level support base for the habitat. Each of the four legs contains 25 tons of lead ballast. The legs have seven feet of adjustment for leveling in variable seafloor terrain through the use of hydraulically-driven screw jacks. The habitat and baseplate were designed to survive severe storm conditions and have successfully weathered hurricanes in both the Caribbean and Florida. The Life Support Buoy (LSB) is a 10-meter diameter buoy (Figure 5: low res/high res) that was provided by NOAA's National Data Buoy Center. The LSB is maintained above Aquarius on a five-point mooring using 2 and 5/8 inch diameter double-braided nylon lines connected to approximately 1.5-meter diameter spring buoys. Mooring plates were installed with anchor bolts grouted 1.2-meters into the seafloor. The LSB includes a communication tower and over 70-square meters of inside work space. Inside are two diesel-powered 40 kW generators, two 18.7 cfm air compressors, VHF radios, a cell phone, and a microwave broadcasting system. The LSB is linked to Aquarius by a three-inch diameter 42-meter unitized umbilical, which contains hoses that supply air from the compressors and oxygen from storage flasks, power lines from the generators, and 2 coaxial cables and 12 twisted pair wires for data and communications. The microwave telemetry system provides reliable audio, video, and data transmission between Aquarius and shore using "Wave Wireless Networking." Wave Wireless is a telecommunications and data communications manufacturer, and the specific system used is their SPEEDLAN 10ptp wireless link. The SPEEDLAN 10ptp is a 10-Mbps wireless point-to-point bridge that provides a secure wireless connection between Aquarius, the LSB, and shore. System upgrades are planned to increase bandwidth for improved video and voice communications that will support new broadcast and education programs.

The Length of an Aquarius Mission

Aquarius missions typically last 10 days. We conduct shorter missions at the start of the year for training and to test systems. The longest missions in Aquarius are 14 days, but this doesn't happen too often. We are talking about a special project next year that might last 30 days. Interestingly, and this relates to the technique of saturation diving that we support, once you are saturated it doesn't matter if you stay 1 day, a week, or a month - the decompression time remains the same. A brief explanation of saturation diving is presented in the article: "How an Underwater Habitat Benefits Marine Science." Also, take a look at the pressure lesson plan to learn more about saturation diving. At the end of missions aquanauts decompress inside Aquarius, where pressure is slowly brought back to one atmosphere (or surface pressure) from the operating depth of about 50 feet - and it takes over 17 hours. Aquanauts then "lock-out" and swim to the surface. People sometimes think that Aquarius is brought to the surface during decompression, but it stays on the bottom; it's the pressure inside Aquarius that is change.





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