How do I destroy the wooden blocks of underground rooms?

Question

I wanted to create a "hellevator" and tunnel straight down, but I encountered an obstacle in the form of a wooden room underground. My Nightmare pickaxe seems to be unable to destroy the wooden block perimeter of this room

How can I destroy these wooden blocks to continue digging down?

Answer

Wood is the only solid block in the game that cannot be destroyed with a Pickaxe (or Drill, later in the game).

You have to use an Axe or a Chainsaw (or a combination tool that incorporates either), just like you would for chopping down a tree. You should have spawned with a Copper Axe.

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