User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-5043481-20130103193646

Has anyone else noticed the streams of bubbles underwater in Tri? Of course you have. But they represent an intriging problem.

Where do they come from?

My theory is that there is a vast underground cave system which is filled with air. When this escapes underwater the bubbles appear! I think the water would flow through the caves and either exit to the surface by a spring, ore whatever.

And another thing, giggi appear everwhere, don't they. And the eggs are not limited to the tundra. I believe that gigginox are travveling through this cave system to lay thier eggs. This would mean that they would be found elsewhere, if we could explore that far underground. It also explains why we only see them in the tundra, as they are far underround everwhere else.