Yes, in the early 60`s the steerer of the last of 4 loaded boats ended up in the water, He heard a strange noise coming from the rudder area on the boat he stepped on to the counter to investigate, tiller bar was suddenly forced over & knocked him over board. at that time there where still parts of the tow path remaining, so he was able to climb out on to it, the boat continued on it`s way & as the steerer on the third boat slowed down to talk to the northern end tunnel keeper in the tunnel mouth #4 boat ran into the back of it, realizing no one was aboard, the tunnel keeper got onto the boat & stopped it. there was a maintenance launch/dingy at each end of the tunnel in those days, so the north end one went in to investigate, they found him on a part of the broken towpath, Ok except for being soaked. No chance of that now as no towpath. very sad for the family concerned in this incident. .