One time some muppet left the lock gate open and the water in that section drained away.
It was fascinating, there were aluminium beer barrels, an old bike frame, a complete toilet pan, loads of trolleys and road signs and bottles and cans.
I dawdled on the Lee and watched through the observation window at the rock-crusher on the Olympic site, just where the bus depot mysteriously burst into flames and burned to the ground the day before it was due to be demolished.