Preston tug Perseverance lost 1936

Preston Corporation steam tug, built William Allsup, Preston 1896
212 grt, 23 nrt, 120.8 x 22.7 x 10.3 ft
Engine builder: Allsup & Co. Ltd., 2 x C2cyl (17 & 34 x 24ins), 98nhp, 2 x Screws
Collided with north training wall near 10 mile marker on 22 December 1936.
Salvage attempts failed

The tug Perseverance, owned by Preston Corporation; after assisting in refloating the stranded Helen Craig [Steamer inbound from Belfast whose 11 crew were taken off by the Lytham St Annes motor lifeboat on 6th December]; on return to Preston, collided with the north training wall near the 10 mile marker [distance in statute miles from Preston], and sank below Lytham Pier [now demolished], on 22 December 1936.

Perseverance in service:

Salvage Divers were reported in January 1937 to be attempting to salvage her. They sealed up openings and lifted her, but she had to be sunk again, and by October 1937, it was reported that the tug would sail no more.
  In 1951, a wreck buoy was still reported to be marking the site.

Lancashire Evening Post, Thursday 11 February 1937:

TEN miles from Preston, towards the open sea, still lies the Preston Corporation tug Perseverance, which sank when returning to the river[Ribble] after assisting in refloating a stranded vessel last December. It lies hard up against the north training wall of the Ribble. You cannot see it, except at low water, and then only the tips of her masts are visible. Navigators, however, know of her position, and she is not a danger to shipping. So far, efforts to raise her have been unsuccessful - it is no easy job - but the salvage workers have retrieved her funnel, and this is now lying in the storeyard in Strand-road. It made a curious-looking cargo as it was brought up the river slung across the bow of a small boat.
  They got the funnel in this way: Salvage operations started during the first week of the New Year, and for some time workmen were engaged in sealing up holes and apertures in the hull so that the vessel could be made as water-tight as possible. Then they started with the pumps and the old tug was raised - but she came up so quickly and unexpectedly that she was soon on the opposite side of the river. In fact the Perseverance took command of the salvage boat, and, under the circumstances, the only thing to be done, was to cut the suction pipe and sink her again, so that the tug should not constitute a danger to shipping. This was done, but in the process the funnel snapped off and was eventually rescued.