The Sea Level Drops by Four Thousand Meters

Without the ocean's abundant water to absorb the sun's heat and regulate Earth's temperature, daytime temperatures would exceed 50 degrees Celsius, and nighttime temperatures would drop below zero, leading to drought and water scarcity. Not to mention other problems: a surface hell, mass extinction—this is simply an uninhabitable environment... And it happened overnight, with no time to react.

Your argument is flawed. If the oceans were to recede so drastically, firstly, a large number of algae, the primary oxygen producers, would die, leading to a drop in oxygen levels. This would cause widespread "altitude sickness," or hypoxia, resulting in mass mortality for all living things, including large and medium-sized animals.

If sea levels drop by 4,000 meters, will Earth still be habitable? Water is the source of life, and this isn't just a saying; algae in the water are a major provider of oxygen for Earth. The average depth of the ocean is 3,700 meters; a drop of 4,000 meters means that a vast majority of the oceans are gone. Earth's water cycle system has collapsed.

More than 200 million years ago, Earth experienced a mini extinction event due to marine regression, which reduced the Earth's surface by about 100 meters. Large species were basically wiped out. If the Earth's surface shrinks by 4,000 meters, then we can only wait for the next Triassic or Ordovician radiation.

They've lost even basic common sense. Without algae to produce oxygen, what good are terrestrial plants? They'd just die from lack of oxygen.

Descent of 100 meters would be the end of the world, let alone 4000 meters, that's way worse than Resident Evil.

This is a rehash of a fantasy novel. The first few dozen chapters are quite exciting, but after these imaginative plots, the author's writing quality noticeably declines. They can't come up with any new plot ideas and just resort to the same old formula of monster-slaying and leveling up in a rehash of fantasy.

I initially thought it was a survival game, but it turns out to be more about fighting monsters and leveling up. All that hard work leading the team to gather food and water only to end up with nothing, my teammates all sacrificed, and me wandering alone? There's no more to look forward to; it's just another game of fighting monsters and malicious humans on the way home.

Sea level will drop by 4000m.

4000 Meters, looks like this