Turtle

length=5
current=0
faceDepth=4
trials=5

function Forward()
	while not turtle.forward() do
		turtle.dig()
		turtle.attack()
	end
end

function Up()
	while not turtle.up() do
		turtle.digUp()
		turtle.attackUp()
	end
end

function Down()
	while not turtle.down() do
		turtle.digDown()
		turtle.attackDown()
	end
end

function Dump()
	for slot=1,16 do
		turtle.select(slot)
		turtle.drop()
	end
	turtle.select(1)
end

function Gravel()
	while turtle.detect() do
		turtle.dig()
		sleep(0.5)
	end
end

function DigDown()
	for i=1,faceDepth do
		turtle.dig()
		turtle.digDown()
		Down()
	end
	turtle.dig()
	sleep(1)
	Gravel()
	for i=1,faceDepth do Up() end
end

function DigFace()
	turtle.turnLeft()
	DigDown()
	turtle.turnRight() turtle.turnRight()
	DigDown()
	turtle.turnLeft()
end

function EmptyInventory(dist)
	turtle.turnRight() turtle.turnRight()
	while current>0 do
		Forward()
		current=current-1
	end
	Down() Down() Down()
	Dump()

	turtle.turnRight() turtle.turnRight()
	Up() Up() Up()

	while current<dist do
		Forward()
		current=current+1
	end
end

function DigTunnel()
	while current<length do
		DigFace()
		turtle.dig()
		Forward()
		current=current+1
		if turtle.getItemCount(16)>0 then EmptyInventory(current) end
	end
	EmptyInventory(0)
end

function FindPosition()
	turtle.turnLeft()
	while not (turtle.detect()) do
		turtle.forward()
	end
	local success,data=turtle.inspect()
	if success and not (data.name=="computercraft:turtle_expanded") then
		turtle.dig() Forward()
		turtle.dig() Forward()
		turtle.turnRight()
		DigTunnel()
	else
		turtle.turnRight() sleep(5)
	end
end



for i=1,trials do
	FindPosition()
end