Maybe you mean the old shipping container they use as a kiln to dry out the planks? https://youtu.be/3jPNyAn5yyk?t=1172 https://youtu.be/3jPNyAn5yyk?t=1172 I

Maybe you mean the old shipping container they use as a kiln to dry out the planks? https://youtu.be/3jPNyAn5yyk?t=1172 https://youtu.be/3jPNyAn5yyk?t=1172 I don't think they use steam there, quite the opposite if I understand it correctly.