Imagine a world where the oceans all dried up, leaving only dry land behind. NASA revealed a remarkable video showing what Earth would look like if the oceans drained
This resulted in shallow land bridges appearing between continents and islands. In the early history of humans, these land bridges were used to migrate around the world.
Our ancestors migrated from continental Europe to the UK through land bridges, as well as from Alaska to the far eastern tip of Russia. Also, the land connecting North and South America was wider and thus easier to navigate between the two continents. Below is a screenshot of what the Earth’s land and oceans could have looked like during the Last Glacial Maximum when sea level was about 125 meters below current sea level. You can see the connecting land in southeastern Asia, Australia, between Europe and the UK and between Russia and North America.After the first several hundred feet of sea-level drop, the next major feature is the appearance of the oceanic ridges.
Around 6,000 feet of ocean draining reveals most of the bottom of the ocean. However, there are still over 4,000 feet of ocean to drain, the last drop from the Marianas Trench, which sits at a depth of 10,911 meters. While there is no concern that the oceans will drain anytime soon, the thought exercise reveals interesting features that our ancestors faced and can help us make sense for early human migration as well as what we could face if another ice age began.
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