How to physically destroy 2011 desktop Mac hard drive

I’ve forgotten the admin password for a 27” 2011 desktop , running 10.17.1.

It will not enter internet recovery mode, which I tried several times with the intention of erasing it.

I don’t want any data on it, but it does contain confidential data that ought not to be accessible by anyone else.

From what I read here, it’s likely there is nothing I can unscrew and remove.

So, just how much damage do I need to do to ensure data cannot be accessed before I send it to recycling?