In this episode, host Zach Urness talks to outdoors intern Rose Shimberg about two of Oregon's subterranean destinations. Urness and Shimberg talk first about the Lava River Cave, a mile-deep lava tube outside of Bend and the longest in Oregon. They go into the formations you can see and the different ways to reserve a trip to the popular destination. In the second half, they discuss the Mitchell Point Tunnel, which opened earlier this year to hikers and bikers. Recreating the crown jewel of the historic Columbia River Highway, the tunnel offers stunning views of the Gorge, with multiple hikes nearby to explore.