the wreck index has the following on the olimpia:
Steel Fishing Trawler 36.57m x 6.55m x 3.5m
registered: grimsby
3 Cyl triple expansion engine 66hp
"This fishing trawler was captured by a german submarine, her crew forced to abandon ship without loss of life, after which she was sunk by gunfire. Wreck lies in a general depth of 44m"
sank 3m E of Coquet Island 08/04/1916
so I guess she wasn't a huge ship in the first place and 100 years nearly on the bottom she'll be well broken up, so might need a bit of sniffing about to find her. sometimes if a wreck is well dispersed it doesn't stande very high off the sea bed, so if there's a bit of swell or chop it can be hard to spot on the finder among the peaks and troughs on the bottom caused by the boat moving about a bit, migh be worth waitinf for a flat calm day and having a mooch about to see if you can spot it and re-mark it on the plotter