NancysToy
Motorbike Professor
Bust it out and do it right. That does not even look like a trap, although it could be a jury-rigged, jobsite improvization. If it is a trap, it looks pretty deep. It is in your best interests, and for your safety, that you should have a plumber repair it and bring it up to code. No amount of money you save would be worth dying or having an explosion from sewer gas...or even just the nuisance from the odor.
Remember that you have more problems than just the gas, if this thing is leaking. The water isn't going down the drain pipe, it is going into the ground. Eventually it could cause settling or cause part of the floor to collapse if it becomes undermined. The empty "trap" is just a symptom. Actually, I wouldn't be surprised it there was no trap there at all, and the standing water before was a sign of a formerly plugged pipe. Now you may have rotted the pipe through...or the roots broke it further, allowing the formerly backed up water to leak out. I agree with the wisdom of pushing a camera through there. It's a good way to find out what is going on. This may just be the tip of the iceberg.
Remember that you have more problems than just the gas, if this thing is leaking. The water isn't going down the drain pipe, it is going into the ground. Eventually it could cause settling or cause part of the floor to collapse if it becomes undermined. The empty "trap" is just a symptom. Actually, I wouldn't be surprised it there was no trap there at all, and the standing water before was a sign of a formerly plugged pipe. Now you may have rotted the pipe through...or the roots broke it further, allowing the formerly backed up water to leak out. I agree with the wisdom of pushing a camera through there. It's a good way to find out what is going on. This may just be the tip of the iceberg.