I'm working just outside pembroke on a new powerstation
Great to see your working Chris. 5 weeks twiddling your thumbs, bet your good at Suduko and probably sleep walk the crossword now also.
Those deep excavations and water can be quite a concern.
I was with Taylor Woodrow at Brighton when they were sinking the main shaft for the sewer tunnel. Top was close piled to get through the shingle then once into the chalk they used concrete segments.
Excavation was with an Hitachi 13tonner and it was never left in the hole overnight. The risk of pump failure was too great.
A couple of 6" submersibles working vertually all the time to keep it under control.
Final depth was getting on for 40metres from memory.
Rings are 1metre each and your already inside a 10m cofferdam.
Yes I know this isnt a 13t Hitachi, but its the only shot I have of the shaft without having to tip the wardrobe out and scan some more.