These screws were driven down by the drive shaft you can just about see on the left, all powered by a steam engine
The screws pressed down on these 'see-saws' which lifted the boat out of the water
Seen on our coach tour of the island
Cattle with cattle egret birds
In dock alongside a disused crane
The concrete structure is submerged for a boat to enter and then 'pumped up' with air to make it rise and form a dry dock
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