I deleted a subsite by mistake using PowerShell but now I can't find it in Recycle Bin of the site collection. I used
Get-DeletedSite, but I don't see the subsite there.
Anyone has got any idea how to restore this subsite?
If the site is not available in 1st and 2nd stage recycle bin then that means it is gone completely.
Now the only option is to restore it from Backup. If you have backup of your site collection then restore just before you deleted the subsite.