Hole in floor

I have this hole in the floor of my car and it looks like it is in a very awkward place to repair. Would I be best cutting out the whole floor and having a replacement panel welded in or just patch the hole? Can the floor be cut out without touching the cross beam that the seat secures into?

Not had a problem like this with a car so not really sure on what to do.

A few photos of said hole


 

Advice would be dig further as if it's holed there it could be suspect in other floor areas too, at least then you know whether a whole section is required or just a smaller repair, may have to chip off some of the bitumen coating or have a good look / prod from underneath  

hubbadubba said

Advice would be dig further as if it's holed there it could be suspect in other floor areas too, at least then you know whether a whole section is required or just a smaller repair, may have to chip off some of the bitumen coating or have a good look / prod from underneath  

Thanks for the reply, I'll get to work on chipping off that coating and see if I come across anything else