Inside Jack Jones Ice Cave near Tennant, California.  There is a north & south passage, this is at the start of the south passage.  The initial entrance had plenty of ice stalagmites up to three feet in height (probably more during a wet year) but after crawling through some intense breakdown the last 300 feet of this portion opened into a magnificent tunnel w/ virtually no breakdown, high ceilings up to 30 feet up & ending abruptly at a lava seal.