I've put the front end of a tj into a huge hidden hole that I watched 3 other jeeps travel through. Just took a slightly different line. The front end was submerged and the engine hydrolocked. Didn't intend to submarine the jeep, just got swallowed up. I feel like a snorkel - like maybe the Hauk River Raider - may have saved the engine. Perhaps other components would have received damage but no way to tell now.