Alvin Gets Back to Work After $42 Million Retrofit

Alvin Gets Back to Work After $42 Million Retrofit

Barely a week since successfully completing sea trials after a three year hiatus, the venerable research sub Alvin is already earning back the $42 million in hardware upgrades and engineering retrofits it's received—showing off its spacious new three-crew cabin with a quick dive to the bottom of the Gulf of Mexico. But this is no pleasure cruise.

"Alvin is functionally a new vehicle," said Harvard University scientist Peter Girguis of the retrofitted sub. The $42 million upgrades include automatic command and control functions, a higher battery capacity, high-definition cameras, and a new forward lateral thruster.

"I think the new command-and-control systems make it easier for pilots to manage the sub, so they can participate more in the dive, rather than just drive," said Susan Humphris, the WHOI scientist who supervised the upgrade. "The biggest advantage of the lateral thruster is that it enables Alvin to move sideways like a crab, saving valuable time in the sub. In the past, pilots had to back up and then go forward to move laterally."

Yesterday, Alvin set off for the 3,30o-foot depths of the Gulf of Mexico for a survey of the environment surrounding the Deep Horizon oil spill site. With the Gulf oil disaster's fourth anniversary quickly approaching, researchers from a number of local universities, led by Marine science professor Samantha "Mandy" Joye of the University of Georgia, are employing Alvin to conduct follow-up sampling surveys to see if the area has recovered at all since the 2010 blowout.

"In the dives in the submarine, we'll actually be able to see the diversity of animals on the bottom and compare this to what a natural soft bottom community would look like," Joye told The Sun Herald. "Our work is aimed at understanding the long-term impacts of the 2010 blowout and sites within 20 to 100 nautical miles of the wellhead."

While the Alvin is at sea, it will also be used by Kang Ding, a Senior Research Associate at the University of Minnesota, to collect prototype water pH sampling canisters that had been left near the region's numerous cold-water methane seeps. The now 50-year-old sub is expected to make more than two dozen dives during the current expedition, which will return to port on April 22. Here's to hoping it survives another 50 years of work. [WHOI via SFGate - Wired]

Original post by Andrew Tarantola on Gizmodo

How a Classic Deep Sea Robot will Sweep 98 Percent of the Ocean Floor

How a Classic Deep Sea Robot will Sweep 98 Percent of the Ocean Floor

Over the course of 4,400 dives, Alvin has done just about everything. Its recovered lost nukes, explored the ruins of the HMS Titanic, and upturned our understanding of the deep sea with the discovery of hydrothermal vents bustling with unimaginable forms of life. But after 48 years of service, the venerable ROV is starting to show its age, and is quickly being eclipsed by newer models.

That's the story, at least, until Alvin gets $40 million in upgrades, and becomes the world's premiere deep submergence vehicle once again.

Alvin is the longest-serving deep submergence vehicle (DSV) on Earth. When it first entered active service in 1964, Alvin was nothing short of revolutionary. Designed as a replacement for earlier, less-mobile bathysphere technologies, the 23 foot-long, 17-ton manned submersible offered researchers the unprecedented opportunity to explore 4,500 meters below the surface. Its 6-foot diameter personnel sphere offered just enough space to cram in two researchers and a pilot, while a trio of 13 cm-wide viewing ports allowed for at least a bit of scientific rubbernecking. However, as Cindy Van Dover, a former Alvin pilot describes to Nature, "sometimes it was a great view, but often it wasn't, so you'd end up watching a video of what the pilot was doing." And in the past few years, France, Russia, Japan, and China have all fielded research vessels with capabilities exceeding Alvin's. Well, that just won't do.

The Woods Hole Oceanographic Institution (WHOI), operators of the Navy-owned vessel, is currently in the first of a two-phase, $40 million upgrade to bring Alvin back up to par. This first phase, scheduled to be completed by the end of this year, will include a bigger personnel sphere, cut from 15.5 tons of titanium with 18 percent more interior space. Three new 18-cm viewing ports will join the existing set. Researchers will be able to record more of their dives thanks to the addition of high-output lighting and HD cameras as well as a new work basket that effectively doubles its carrying capacity. Alvin will be more maneuverable as well, receiving a new command and control system, stronger thrusters, as well as revamped syntactic foam—which provides buoyancy and structural rigidity when compressed at depth.

When Phase Two begins by 2015, Alvin will be completely retrofitted to withstand the immense pressure 6,500 meters of water exerts on a hull, opening up 98 percent of the seafloor for exploration. (Only China's 7,000 meter-rated Jaolong will be able to dive deeper. This second round of improvements will also see Alvin's antiquated lead-acid batteries swapped out for lighter, higher-capacity stacks that should extend its maximum dive time from 10 to 12 hours.

You can check in on Alvin's ongoing evolution via the WHOI live workshop webcam.

[Wikipedia - ROV World - WHOI 1, 2 - Nature - Image: Kurt Uetz / Woods Hole Oceanographic Institution]

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