a claim of ownership

The excavation took 16 months of 24-hour working to complete and required the sinking of a 65ft shaft, from where workers carved out the passageway and lined it with reinforced steel and sprayed concrete.

They planned for the worst, bringing lots of emergency supplies.

Today the ubiquitous cabin cruiser seems to many a Sunday skipper like nothing more than a watertight version of the car he left parked at the marina.