The source of a rotten odor that made working in the offices of some carriers at Mineta San Jose International Airport has finally been identified. Now the problem becomes how to fix it.

It turns out a ruptured sewer line beneath Terminal A is what’s been stinking up the joint for several pungent months. An airport spokesman said the elusive source of the smell—discovered by sending a camera underground—will be difficult to fix since it involves some digging.

It’s unclear whether the line ruptured during the recent renovations at that terminal.

Although the repairs aren’t done, airline employees did get some relief this week. For some reason, the outhouse outdoor disappeared.

The smell had gotten so bad some carriers were actually threatening to withhold rent if the airport couldn’t fix the problem.