Pray explain how you can open both top and bottom gates of a lock AT THE SAME TIME!
More likely that the leak in the embankment which has been reported several times over the last 3 years caused the canal level to drop. The boater nearest to the lock, that's his boat, which had no insurance or licence or BSC we understand, went up and opened all 4 paddles. They were found to be open at midnight after the breach had occurred.
Old news, incorrectly reported.