I made a mob trap, and it works pretty well. I was wondering if there were any programs/mods to find unlit caves withing 144x144 blocks of you or whatever it is. If you know please post a comment. Thanks.
The green wool represents a piston, either sticky or normal. You stand in the white space and power both pistons at the same time. Make sure you don't accidentally light the TNT. If it works you should be able to see through any walls that you are touching you so you can use it to find caves.
WHY WOULD YOU BUILD A NICE MOB TRAP TO GET ITEMS ALL LEGIT IF YOU'RE JUST GIONG TO CHEAT TO MAXIMIZE ITS EFFICIENCY?!?!?!?!?!
I WOULD PERSONALLY GO CAVING. YOU COULD JUST USE MCEDIT TO FILL UP ALL THE CAVES WITH STONE THOUGH.
^ I tend to agree with the spirit of this statement. However building the trap itself is a fun project.
I would suggest that if the OP has expended some effort to explore & lightup caves in the area without resorting to cheats, that his trap should be spitting out more than enough items for his needs. Many of my traps produced in excess of 1000 items per hour after spending a 2-3 hours exploring caves. You don't have to get every dark spot to have a trap that produces reliably. Make sure your trap design itself is efficient. The less time mobs spend from the time they spawn to their death at grinder will greatly effect output.
X-ray mod, or an x-ray texture pack.
But if you don't want to cheat, have a piston push TNT into your head, and make it so once it does, you can't be pushed out of the way of the TNT so your head is inside it. You won't suffocate, but will be able to see every cave there is underground.