Cave streams in Iceland?

The massive snowpack up at Hengill has left many of our streams buried in 8-10 feet of the miserable white stuff. There was only one thing to do on our trip this month: DIG! Here are some shots of various folks down the resulting holes:

The warmer streams in particular have carved tunnels through the snow with up to 2 or 3 feet of crawl-space, making at least Alex and I feel like we were back in an Alabama cave stream. A weird convergence. Here's a shot of Stream 9 flowing through its "cave." There is some light filtering through the snow - we'll find out if any primary production is occurring.