Admiralty Floating Dock during WW1

[Whickham]

No Mike, not a floating dock but a lock gate. I'm not aware of any floating docks that came to grief so close to home. One of the Tyne built ones was wrecked off South Africa on her delivery voyage and another, a second-third hand one sank in Biscay.

[Whickham]

12 or 13 years after the initial discussion, this photo cropped up on Facebook this morning which shows the dock gate/caisson aground near Trow Rocks.
Still not found any details. Some comments that it was 1916 when it happened and others that it was 1919. May have been on the way to Sunderland but then maybe Gibraltar.

Photographer unknown