Straightforward one from Freeview's blurb on last night's "Shipwrecks: Britain's Sunken History".
"The terrible toll taken by shipwrecks was such that in the winter of 1820 some 20,000 seaman lost their lives in the North Sea alone. That's 20 jumbo jets."
Where are these 1,000 passenger capacity jumbos, or was an assumption made about ground casualties?