Paladin327 t1_iy3o1b8 wrote
Reply to comment by bak3donh1gh in TIL More than 80 percent of the ocean has never been mapped, explored, or even seen by humans and as a result, we know more about the surface of Mars than Earth by [deleted]
When underway, a submarine will generally not use their active sonar as using it kinda defeats the whole purpose of a submarine. It’d be like turning on a flashlight in a dark room when you’re trying to not be seen. Subs rely on passive sonar mostly, so unless an uncharted undersea mountain is transmitting noise, it’s invisible
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