The boat in the main images has just been raised 24 metres (79 ft), on the Falkirk Wheel boat lift,
A series of three pips show progress as One boat is lowered and One raised, in all three images the waterproof plate that keeps the tray full of water can be seen, Once the wheel has reached the top and has been locked in place the plate is lowered and water levels equalised,
The fourth pip is a previously posted image with a longer view of the boat lift,

Full information and facts of the wheel here en.wikipedia.org/wiki/Falkirk_Wheel

Strongly recommend a large view,

Finally, a musical link, www.youtube.com/watch?v=kK62tfoCmuQ