![Able Seaman Patrick Hennessy dons his wetsuit just before Alvin was set to dive. Two swimmers always accompany the submarine before it goes underwater, and when it re-surfaces. They attach the lines that are used when Alvin is deployed and retrieved.](4.jpg)
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Able Seaman Patrick Hennessy dons his wetsuit just
before Alvin was set to dive. Two swimmers always accompany the submarine
before it goes underwater, and when it re-surfaces. They attach the lines
that are used when Alvin is deployed and retrieved.
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