I was just watching this video and blood pressure went up in the end! His drone was trying to land in the ocean!! How do you sent that to not auto land?
Based on the sounds the Mavic was making, it seems like it was auto landing because the battery reached the critically low level. If that happens, all you can do is throttle up and attempt to steer it to a safe landing location. If you keep it in the air too long though, the battery will eventually shut off and the Mavic will drop like a rock. That would happen if any of the battery cells reach 3.0V (see more details here).