A breach opened in the wall of the Llangollen Canal near Whitchurch in Shropshire on Monday, leaving several boats stranded in a large hole after part of the canal bottom collapsed.
Water poured out into nearby land as the bank gave way, prompting an emergency response.
Crews dealt with what officials described as a landslip affecting the canal and worked alongside partner agencies to secure the area.
Members of the public were asked to stay away, including from Whitchurch Marina, while the incident was managed.