Pump Hole

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10T Hydraulic Knockout Punch Hand Pump 6 Dies Hole Tool Driver Kit w Metal Case    US $100.90

10 Ton Hydraulic Knockout Punch Driver Kit Hole Tool Hand Pump Conduit 1 2 to 2    US $100.90

HYDRAULIC KNOCKOUT PUNCH HAND PUMP HOLE TOOL DRIVER KIT    US $89.90

Summary - You will be looking at a 30 horsepower, 460VAC, nominal 3500 RPM , 60Hz, 400 gpm , 200 ft head motor pump to pump 7 million gallons out of the hole in two weeks. The pump design would be about a nominal 3x3x9 with the basic 9 in. impeller trimmed to match the design head.
With 50 Hz power supply you will need the larger impeller diameter. The pump will need to be put down into the hole because a high speed centrifugal pump will not lift cold water more than about 15 feet unless specially designed. If the water is deep and as the water level drops it may be necessary to reposition the pump.
There are a number of vendors of either inline or base-mounted motorpumps which could be suitable.
Supporting both the pump and piping will be an interesting design problem.