Best techniques to make the hole in the eps board

Gents,

What is the best techniques to make the hole in the board ? I need a 10 cms deep for a 13 cms board …
I have a router with bits but small like 3/4 cms … electric jigsaw , circular saw , TNT ?

I saw a square knife hot wire but I don’t have one !!!

Thanks to share your technics !!

It’s quite easy, just use a 8mm metal drill and grind down the head to make it flat.
Works like a charm.
I’ve used two metal rods as a guide rail for the router to get consistent depth.
Just check out my build:

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Best tool ever …. Hot knife


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