User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-74.193.210.169-20120622162640/@comment-5043481-20120809192840

Large whales can dive deeply as they can dissolve huge quantities of oxygen in thier bodys, so they can use much more than thier lungs can hold. Humans cant do this as we have small bodies. For this reason most humans cannot go underwater for more than 2 minutes. Ravantie being many times larger than a whale it would be able to store huge amounts of dissolved oxygen enabling it to stay down for immense periods of time.