Colin Furze had help from sky tv to build that bunker
It is possible to create a large concrete lined hole with minimal use of shuttering. You create the four walls to a height of about 4 foot (*) on the surface of the ground and then excavate under them letting them sink into the ground as you dig. Then you add a few more feet to the walls and dig some more. Repeat until the hole is deep enough for the purpose intended.
(*) four foot is the size of standard plywood sheet that could be used to mould the walls out of concrete.
If the ground is very wet then the way to move the soil from the hole to the front of the house could be to use a slurry pump and a large hose through the house.
The method of digging deep worked for the Brooklyn Bridge ( very wet soil )
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