This is alleged to be good for their health and since the average age for a walrus seems to be about seventy I can only assume that it works.
I thought I would have a go myself- but half hardheartedly as I am a pampered westerner.
I ran myself a cold bath and very rapidly soaped myself down. I felt unusually alive for much of the day and have now been doing this for nearly a week.
I have no idea if it is doing me good- but I feel good and this makes it worthwhile.