A national survey looking at what objects lie beneath the surface of the UK's canals has uncovered some surprising items.
Rubbish thrown into rivers and canals cause big problems for wildlife and boats.
A four-month long survey found that an average canal lock - about the size of a tennis court - will contain:
- 1 bicycle
- 1 shopping trolley
- 1 traffic cone
- 67 glass bottles
- 4 tyres
- 23 cans
- and 150 plastic bags
The Canal and River Trust charity say that it costs them about £1 million each year to clear out what they can.
The bits that get left behind can trap wildlife, or poison the water.