Sea Technology

JUL 2017

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Page 29 of 68 July 2017 / st 29 the Spirit of Sacramento with an overhead heavy lift. But the surrounding environment posed several problems. The Spirit of Sacramento sank in an area called False Riv- er, which is known for strong currents up to 2.5 kt. There's also a short slack water window in the area, with just 15 to 20 minutes between high and low tide. Those conditions are challenging for divers. When Global first arrived at the scene, the Spirit of Sacra- mento was completely capsized with its keel visible above the water. "We have techniques to manage that situation, but this one was going to be fairly tricky," Watson said. "Our plan was to effectively roll the vessel over onto its keel before we could lift it up." After a full day of working on the boat, the Global crew went home for the night. When they came back the next morning, the Spirit of Sacramento was sitting on its side. "The current had somehow rolled the vessel over 90 degrees, which vastly changed the scope of the project," said Watson. "That was a bit of a curveball that came up in the middle of the job. We had to readjust our plan midstream. It actually made the job easier, but it was still something we had to adapt to." The Spirit of Sacramento had shifted but still needed to be rolled onto its keel. On top of that, there was an- other problem. Since the vessel was only meant to travel on service or protected waters, the boat was very lightly built. "We had to be delicate with how we rigged the vessel to ensure it would stay intact while lifting it with a crane," Watson said. The team decided to reinforce the hull to keep it from collapsing when they picked it up, which called for some crafty engineering. Field crews fabricated the pieces they needed on site to help move the salvage along quickly. "The particular fabrication we had to do on this project was unique just because of the design of the boat," Watson said. While Global coordinated with various local subcontrac- tors for the Spirit of Sacramento project, they were forced to outsource a crane from Seattle for the heavy lifting. "There was nothing in the Bay Area large enough to lift the vessel, so that was pretty unique," Watson said. "We have personnel and equipment staged strategically along the coast for this type of response." (Top and Bottom) Dive team members tend to divers inspect- ing the Spirit of Sacramento to determine any potential un- seen damage and cause of sinking. Crew members oversee the parbuckling of the vessel.

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