The John Strachan was a 42nt iron steamlighter, built by Swan & Co. of Glasgow, launched in 1885. She had a single hold.
She was lost on the 8th December 1917 whilst on passage from Port Ellen to Loch Etive. How the sinking came about is something of a mystery, however it is unlikely that she came to grief in a severe storm as her hull is completely intact and undamaged. Given the fact that her single hold was completely empty, it is more likely that she was simply too light, and became unmanageable because of this, her crew being unable to keep her off the reef. Her loss could also be put down to a navigational error in poor visibility leading her to run aground on the reef. At some point she must have slipped off the reef into her current position.
Items reported to the Receiver of Wreck include three bottles taken from the seabed.