The lump approx. 200m off the end of Eastbourne pier is probably the Seaflower which was lost on the 6th of September 1849 after it sprang a leak.
From Sunderland with Captain Atkinson in charge the Sea Flower was on a voyage from Guernsey for London with a cargo of granite, which having not dived this mark I would assume is what the 'lump' is!
Lloyds shipwreck index has the date for the Sea Flowers loss as June 1849. It also references ,G F Chambers book, 'Eastbourne Memories' which refers to the wreck as the Mayflower, although in the index it's listed as the Sea Flower!
The late Mr. Gasson of Eastbourne was mentioned in a letter to the newspaper in 1938, which described him swimming to the wreck or, more, the granite blocks.
