Crops can be grown underground just fine as long as you have adequate light sources (9 or above), and in fact with artificial light like torches they’ll grow at night as well.Make sure to fill in or light up any pockets behind your walls that you leave behind so that mobs don't start spawning into them and surprising you during renovations-or just haunting you with creepy sounds.Plan carefully, because every block of space your build occupies is twice the work, since you have to dig it out too.Massive hidden underground base by Reimiho.Underground base with a raised platform by CubeU.