The large volume of the superstructure of the Mersey class, pictured nght. cannoi be pushed any further into the water by the fixed weigh) ol the boat Although completely upside down as [he strops are released it is deaf that the boat is very unstable m this position as she is balanced precariously on the cabin top and a small section o deck at the bow She wifl recapsize into the upright position in a mane* ol seconds.