How do you say deep hole in French?

There are several ways to say "deep hole" in French, depending on the context:

Formal:

* Trou profond (m.) - This is the most literal translation and is suitable for most contexts.

* Puits profond (m.) - This translates to "deep well" and could be used if the hole is deep enough to be considered a well.

Informal:

* Grand trou (m.) - This means "big hole" and can be used when emphasizing the size of the hole.

* Trou béant (m.) - This translates to "gaping hole" and emphasizes the depth and openness of the hole.

The best choice will depend on the specific situation and the desired level of formality.