Black water valve cable

while on our trip up to visit our son in Virigina we stopped in Bull Run to dump and found the cable connected to the black water tank valve wasn't connected . Thus here we are up the proverbial creek without a way of using the privy. Have called all dealers with 50 miles an all are booked for the next week . The Lance 881 is a basement unit an with the drawer removed I can see the cable an connection but cannot reach it . Would it be possible to cut a hole in the floor without compromising it structural integerty of the camper? Any assistance would be helpful.