Probably whaling or salmon fishing ships from when this estuary was a major wintering spot for the ships in the late 1800s.
"Evidence of sunken wooden ships has been found in the mud around the island-- remnants of the time when these protected waters served as a winter moorage for sailing vessels and a “graveyard” for squareriggers."
Submerged hulls of sunken wooden sailing ships
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By kjfitz @ 2011-09-25 21:20:45
(updated 2011-09-26)
kjfitz
@ 2011-09-25 21:21:45
More to the east as you travel around the north side of the island.