Boolean modifier gone wrong

While modifying a ship, I used the Boolean modifier to create a hole on the side of the ship. When I clicked applied there was a massive lag spike, and fearing a crash undoing the past two hours of work, I saved the file

After doing this I noticed the error

I am unsure on how to correct this problem, and deleting the vertices causes lag
Any consultation is welcomed

Edit:The title

Without seeing the file, my first guess (seeing all those verts) would be that you had subdivision surface modifier on when you tried to apply the boolean.

Apply your booleans first, and then add the subdivision modifier afterwards.

Note - You can retrieve old versions of your blend file after a crash by going to File > Recover > Autosave and selecting the first file listed that contains the proper file name. It’s usually more up to date than selecting File > Recover > Last Session.

Thank you for advice should I expirence another crash, and for avoiding the same boolean mistake
As for fixing it I still don’t know

Here is the file for you to take a look at

DevilsReach_Edited stairs.blend (4.0 MB) DevilsReach_Edited stairs.blend (4.0 MB)

Did you use the eye to cut your boolean? Geometry was just messed up…
Instead, I took a cylinder and used knife project…deleted half of the eyes and replaced the mirror modifier…


DevilsReach_2.blend (2.9 MB)

I did use the eye to cut the boolean. Thank you for fixing the error

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