| http://www.w3.org/ns/prov#value | - Commissioned in 1964 as one of the world???s first deep-ocean submersibles, Alvin has made more than 4,600 dives.The sub has undergone many upgrades over the years, including replacement of its steel personnel sphere in 1973 with one made of titanium, enabling access to a greater percentage of the seafloor.The sub???s most famous exploits include locating a lost hydrogen bomb in the Mediterranean
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