Blocked drain!

[Brian]

If you're on mains drainage then I'd be inclined to try a caustic soda drain cleaner first - follow the instructions very carefully as it's nasty stuff but will get through most organic blockages.

However, I'm a bit concerned about the water bubbling up outside the pipe. Could an underground pipe have collapsed so that the blockage is caused by soil/clay? An exploratory dig should give you the answer.

Good luck!
Brian