Why Can't I dig down on my Imported Landscape

I’m very new to Unreal 5, I’ve played around with autolandscape textures, sculpting, water & a bit of building design but I’ve hit an impasse. My imported landscape cant be sculpted down no matter what settings i’ve tried nothing happens & I want to make a deeper ocean.
Now the map is huge 900 square KMs, I’ve tried importing it at different heighs all the way from -50000 up to 200000 in height but nothing changes. Can anyone help? Ill provide more info if needed

Hey there @IRMrDucky! Welcome back to the community! Are you using the water plugin for the ocean? If so, go into your landscape mode, and over to sculpt and create a new layer above the water layer. Then Sculpt on that.

Or in the case of importing a height map and that one being the bottom, you could import it above the water, or you could change the water’s blend mode to “Max” which should help.

Ran into this as well. I couldn’t sculpt below the waterline of a river more than a few feet.

For me, it was the greyscale range of the heightmap causing the issue.
Had to re-export the heightmap with enough pixel value range to allow for modifying the landscape below the water surface.

Here are a few links that helped me:
Landscape import basics | Epic Developer Community (epicgames.com)

Calculate the Size of Unreal Engine Landscapes - Motion Forge Pictures

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I am experiencing this issue after going through hours of Gaea tutorials and finally making my island for my first level xD

I also sculpted on it for a good 10 hours before adding water only to realize my ocean is 3 feet deep infinitely. I couldn’t sculpt any lower. Now, i’m no mathematician so those links you provided while very detailed… are lost on me.

I will continue to try to figure it out, but maybe a tip or two for a beginner?? :3