A Coast Guard member operates a crane aboard the Coast Guard Cutter William Tate in order to bring a concrete block, or sinker, aboard the ship at Coast Guard Sector Delaware Bay, in Philadelphia, Feb 6, 2018.
The sinker is a large, 18,000-pound block, which is used to anchor buoys in place that will guide ships safely through channels.
Coast Guard photograph by Petty Officer 1st Class Seth Johnson
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