Digging an inspection pit

[WiNgNuTz]

Not sure if you know 'Dan!' that used to be on here?  Him and his Dad dug a pit in their garage so should know about it.

I knew someone had done it, could not for the life of me think who it was!

Of course, our very own Mr Lobb might be able to offer some advice as well, though I can't be sure he dug his own pit...