Oceans may cover more than 70% of the Earth’s surface, but we have better maps of the moon than we do the seabed. There are good reasons for that: The ocean floor is obscured, and the harsh environment makes it hard to send humans down to get a closer look. But as robots improve, we may finally get a clearer picture of the deep abyss. There are a number of startups racing to map the ocean in greater detail, but the latest to snag fresh funding is Bedrock Ocean, which recently closed a $25 millio...