Existing, living, or carried out underneath snow.
“subnivean, adj.” OED Online, Oxford University Press, January 2018, Accessed 16 March 2018.

I like to look back at my old pictures pretty regularly and see how much I have progressed. A bunch of it is simple stuff, some of it is just a feeling. Anyhow, I’m sick, I’m tired. I’m going to bed.