That would be the drain to our kitchen sink. Fun, huh? Our house is poorly insulated and sometimes the pipes freeze under the house. It happens to the kitchen sink and the bathtub occasionally. This freeze is being particularly stubborn. M has a branding iron that he heats in the wood stove and can drop down the pipe under the house to help thaw it. Usually it takes about 4 to 8 rounds of that to get the water flow going again. Not today. He's been working on it since 2:30 and it's still frozen. He's thawed away a couple of feet worth of ice, but we still haven't broken through the end. Not fun. Tomorrow it's supposed to at least get above freezing, so hopefully we won't be fighting this too much longer.