Scenario
Boy A: During the night, my friend and I were lying down outside in the hayfield.
Boy B: And?
Boy A: We saw a spaceship. It was a hollow box-shaped vessel.”
By the word hollow I mean that the spaceship is empty and the boys could see the box-shaped vessel was hollow because it was made of glass.
I’m trying to figure out the French equivalent of “A hollow box-shaped vessel.” I’ve arrived at « Un vaisseau creux façonné comme une boîte ». However, I feel like there is a shorter way to say “a hollow box-shaped vessel.” :/
What is the French equivalent of “a hollow box-shaped vessel.”?