It's incredible that 80-120 ton animals like blue whales can even swim, though water physics helps them in that regard. This got me wondering if a squids method of propelling itself through water would work when scaled up that much. I imagine that much of the creatures anatomy should be remodelled to allow for enough force in its water jet(s). Cephalopods like squids and octopuses can propel themselves by drawing water into their mantle, though the gills and spit it out through their siphon. This is great design because they breathe as they swim. I thought I could take inspiration from this and make a filter feeding giant that draws water for feeding and expels it through tubes on its back for propulsion. I could make it breathe water as well to get three birds with one stone, but I wonder if it has to be a warmblooded mammal to get that big. Anyway...
Is this method of propulsion equally or more viable than regular swimming? How much water pressure would a 80-120 ton animal need to move itself against water currents?