Im visiting Mt. St. Helens and the surrounding area soon, and I heard some lava tubes around there are worth look. Definitely visiting ape cave, but its hard to find the details on other tubes. Has anyone here been, and where would you recommend?

I was walking from Totnes to Marldon today when I noticed a limestone quarry with what appeared to be a cave entrance.  The quarry is just to the right of the footpath, in an area marked on the map as Cray's hole plantation, near berry pommeroy. The hole, a few metres up the face, was big enough...