This is it... directly under Piglet's house.
5 seconds sound clip from The New Adventures of Winnie the Pooh - Nothing But The Tooth / Gone With The Wind (S1E11).
You can hear this line at 00:06:14.816 in the Blu-ray version of the episode.
Quote context
[...]
- Now remember, stick close to me. The worst thing in tunnel excavation is losing your bearings.
- We don't want to lose our tiggerings, or rabbitings, either.
- Enough lollygagging. Time to get to work. It's a long way to Tipperary.
- Tipperary? But Piglet doesn't live in Tipperary.
- Uh, need to make a right turn.
- This is it... directly under Piglet's house.
- Whatever we do next, I hope it's a little less... moist.
- Well, since Piglet's not coming out, and we can't get him out, there's only one thing left to do.
[...]