Yeah, easy.

By flooding the Qattara Depression near Egypt.

With climate change causing rising sea levels and threatening coastal cities around the world, people have started looking for wild solutions to help counteract this problem. One of the crazier, but surprisingly feasible ideas, is to flood the Qattara Depression in Egypt. Yeah, you heard that right—just flood a giant desert hole and maybe, just maybe, we could lower sea levels by 3 mm. Sounds like something straight out of a sci-fi movie, but let’s break it down and see if it could actually work.

Why the Qattara Depression Could Be the Answer

The Qattara Depression is basically the lowest point in North Africa, sitting about 133 meters below sea level. It’s located in the Egyptian desert, right near the Libyan border, and it's huge—about 19,500 km² (that's roughly the size of Switzerland). The idea is that if we could flood this giant hole with water from the Mediterranean, it could theoretically help bring sea levels down a little bit. And while this may sound absurd, it’s actually not as crazy as it seems.

Crunching the Numbers

First, let’s get some basic numbers out of the way. The Qattara Depression has an area of 19,500 km², which is equal to 19.5 x 10¹² m². The average depth of the depression is around 50-60 meters, so let’s go with 50 meters for simplicity.

Now, let’s calculate how much water could fit into this depression:

Water Volume=Area×Average Depth=19.5×1012 m2×50 m=975×1012 m3=975 km3
Water Volume=Area×Average Depth=19.5×1012m2×50m=975×1012m3=975km3

So, if we flooded the Qattara Depression, it could hold 975 km³ of water. That’s a lot of water.
How Much Water Would It Take to Lower Sea Levels by 3 mm?

Now, let’s take a look at how much water we’d need to lower the sea level by 3 mm. The total surface area of the oceans on Earth is about 361 million km², so here’s how much water we’d need to remove to drop the sea level by 3 mm:

Water Volume=Ocean Area×Height Decrease=361×106 km2×0.003 m=1.083×109 km3=1,083billionm3
Water Volume=Ocean Area×Height Decrease=361×106km2×0.003m=1.083×109km3=1,083billionm3

So, to lower sea levels by 3 mm, we’d need to remove 1,083 km³ of water.

Could the Qattara Depression Make a Difference?

Now, here’s the interesting part. The 975 km³ of water that could fit in the Qattara Depression is almost enough to lower sea levels by 3 mm—just 0.9 mm shy. Okay, so it’s not quite the full 3 mm, but it’s close. In other words, flooding this desert hole could bring sea levels down by about 30% of what we’d need to hit that 3 mm mark. So, while it’s not going to save the world, it would definitely help.

But if we wanted to lower the oceans by the full 3 mm, we’d need to find a few more giant holes around the world to flood. Maybe we could try this out with some other deserts or large depressions... who knows?

The Catch: It's Not as Simple as Just Opening the Floodgates

Now, before you go tell your friends about how we’re going to flood Egypt to stop rising seas (no, this isn’t the plot of a new action movie), there are a few problems.This isn’t exactly the most eco-friendly solution. Flooding a large area of land could mess with local ecosystems, disrupt wildlife, and have unforeseen environmental consequences.

And don’t forget, we’d need to make sure we don’t flood Cairo while we’re at it.

But that is unlikely when we build a dam on canal between Sea and Kattara . It would be also a great powersource.

You know what? Just give me, ... I don't know... 50 million bucks and I will make it happen with couple of excavators and some TNT.
Realy.
And then We'll throw a party by te new sea.

Here's DIY version of what I'm thinking

The Bottom Line

Flooding the Qattara Depression could theoretically help lower global sea levels by about 0.9 mm, which isn’t a huge amount but definitely something. Of course, it’s not a practical solution on its own—it’s just one weird idea in the larger fight against climate change. But hey, every little bit helps, right? If we could build the infrastructure and manage the ecological consequences, maybe this could be one of the many small tricks we use to fight rising seas. Just don’t expect the oceans to start shrinking overnight.

So, if you ever want to sound like the smartest person in the room, just tell everyone about how we can lower sea levels by 3 mm by flooding Egypt’s giant desert hole. It’s the perfect mix of science, humor, and a little bit of crazy ambition.