Hobopolis
From A KoL Wiki
WE NEED INFO ASAP!!!
The Clan Dungeon costs 10 million meat. However, after that price is paid, you have to pay another 1 million to unclog the sewer, so the total cost is 11 million. That meat has to be paid directly from clan coffers.
Paying to unclog the sewer gives the following message (presumably visible only to the person who clicks the payment button):
A squadron of plumbers marches down the stairs into the basement. After a few minutes' work with a variety of nasty-looking implements, they march back out without a word.