Setergrotta, 21km north of Mo i Rana and signposted off the E6, is altogether less dragooned and considerably more adventurous than nearby Grønligrotta. Highlights of the two-hour trip include a couple of tight squeezes and a thrilling shuffle between rock walls while straddling a 15m gorge. The operators provide headlamps, hard hats, gumboots and overalls. No credit cards.
