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The William D. Sanner was formerly a luxury yacht that had been converted to be used as a harbor pilot boat for the Maryland Pilots. After delivering a pilot to the M/V Levernbank on the night of 1 December 1938, the Sanner unwisely crossed in front of the other vessel without enough clearance; the Sanner smashed into her starboard side. The wreck was eventually wire-dragged in 1944 and forgotten.

The wreck lies very close to the site of the Chilore in 70' of water. Her hull is intact, similar to a steel bathtub, with her superstructure spread within and around the wreck. The wreck is abundant with artifacts as she is not dove often. Portholes can still be found on and off the wreck attached to loose hull plates, as well as bronze blackout covers, silverware, miscellaneous china, and a variety of other artifacts.