tunnel

function getFuel()
	while turtle.getFuelLevel() < 70 do -- checks how many fuel and gets more only if needs to get more --
		while turtle.getItemCount(1) < 15 do
			turtle.select(3)
			turtle.placeUp()
			turtle.select(1)
			turtle.dropUp() --this "should" ensure that it doesn't pull 64 fuel out while you already have 		   some and take up slot 3 with it by dropping existing coal in and getting more --
			turtle.suckUp()
			turtle.select(3)
			turtle.digUp()
		end
	turtle.select(1)
	turtle.refuel(10)
	end
end

function enderChest() --Selects ender chest, goes through for loop to drop items off--
	turtle.select(2)
	turtle.placeUp()
		for i = 4 , 16 do
			turtle.select(i)
			turtle.dropUp()
		end
	turtle.select(2)
	turtle.digUp()
end

function dig() -- spin and dig --
	turtle.turnLeft()
	turtle.dig()
	turtle.turnRight()
	turtle.turnRight()
	turtle.dig()
	turtle.turnLeft()
end

function digMid() -- moves forward then digs out the middle layer--
	turtle.dig()
	turtle.forward()
	dig()
end

function digTop() -- moves up and digs out the top layer and then goes back down to middle --
	turtle.digUp()
	turtle.up()
	dig()
	turtle.down()
end

function digBot() -- moves down and digs out the bottom layer then back up to middle --
	turtle.digDown()
	turtle.down()
	dig()
	turtle.up()
end

-- asks how far to dig, takes the value you give it and goes through a for loop to dig out your 3x3 tunnel --
local far = 0
term.write("How far should I dig: ")
far = read()
for i = 0, far do
	getFuel()
	digMid()
	digTop()
	digBot()
	enderChest()
end