I got stuck in water like that once- giant pit from hell. Ended up eating my drivers side. I was seeing waves on my drivers side window! Luck would have it, the passenger side was pointing to the sky- I thought I was gonna flip over. I thought the engine had stalled. Somehow it kept running.
Not only did it keep running, I threw the truck and reverse, and I think the mud tires paddled its way back out.
I was so lucky I didnt hydrolock. And Im certain the little jeep that was with me wouldnt have been able to get me out.