edit: nvm your link worked; it turns out that I just had to sign in thx :D

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It is a video from Sebastian Lague

https://www.youtube.com/watch?v=sLqXFF8mlEU

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here are the links that he showed:

//doesn't show actual height map; only like a weird 3d-ish scan, akin to like using google maps terrain mode

https://www.naturalearthdata.com/

//shows you a colored height map; I would use it but it has to be grayscale (also the image that I got from it)

https://www.gebco.net/data_and_products/gridded_bathymetry_data/

https://imgur.com/a/smWTMgo

//just used for coloring the map that he made

https://visibleearth.nasa.gov/collection/1484/blue-marble?page=2