The Thames could be thought of as England's longest archaeological site, and no fewer than 90,000 objects recovered from its foreshore are in the collection of the Museum of London, whose 30-year relationship with London mudlarks is both committed and highly regulated.
But if people want to swim in the Thames, if they want to take their lives into their own hands, then they should be able to do so with all the freedom and exhilaration of our woad-painted ancestors.
I've just swum the length of the Thames. I feel quite tired.
Because of the Thames I have always loved inland waterways - water in general, water sounds - there's music in water. Brooks babbling, fountains splashing. Weirs, waterfalls; tumbling, gushing.
I was born in Oslo, Norway, but now live in the suburbs of Southwest London, right near the River Thames. It's a lovely part of the world.
Someday when peace has returned to this odd world I want to come to London again and stand on a certain balcony on a moonlit night and look down upon the peaceful silver curve of the Thames with its dark bridges.
The Thames is liquid history.
Below us the Thames grew lighter, and all around below were the shadows - the dark shadows of buildings and bridges that formed the base of this dreadful masterpiece.
If my critics saw me walking over the Thames they would say it was because I couldn't swim.
The difference between a misfortune and a calamity is this: If Gladstone fell into the Thames, it would be a misfortune. But if someone dragged him out again, that would be a calamity.