The Thames depth varies along its route, at its source, at low tide its about 11 metres, at Woolwich its about 6.5 metres and at London Bridge its about 1.8 metres.
Tacitus the Tourist!
Publius (or Gaius) Cornelius Tacitus (56AD-120AD) was a senator and historian of the Roman Empire.
All chained up!
Have you have seen the chains that loop along the Thames foreshore wall (river side) in central London?