This is the third level that you come across in Pikmin 3, where you and your comrades get separated once again, and you discover the electricity conducting Yellow Pikmin.
This level is the cause of all kinds of stress, when it comes to the story, as there are many important dealings that take place here. The white snow does nothing for your orientation on this map, either, for I remember getting turned around many times.
It took me a little too many in-game days to clear this map, so long as you're only counting the story missions. The boss that you find lurking in the depths of a cave, here, is unforgettable. I can't say much about him without spoiling all the fun of figuring it out for yourself, but its clever use of the dark really makes you feel like you're going to be dinner if you ever gave it the chance.
I'm pretty sure your Pikmin don't really want to be eaten alive, either