| UK Cave systems
|| Underground Boat rides
Arthurs Labyrinth - Sail along an underground river, through the
great waterfall, and into King Arthurs Labyrinth.
Tunnel trip - Travel by boat through Islington tunnel on the Regent's
Canal for approximately three quarters of a mile. When the tunnel first
opened boats had to be pushed through by a process of "legging" where
men lay on the boat and pushed against the walls with their legs.