-- Save the initial position of the turtle
local initialX, initialY, initialZ = gps.locate()
 
-- Dig a 2 block tall, 1 block wide tunnel of user-inputted length
function digTunnel(length)
    for i = 1, length do
        turtle.digUp()
        turtle.dig()
        turtle.forward()
        turtle.digUp()
        turtle.dig()
 
        -- Place a torch every 11 blocks
        if i % 11 == 0 then
            turtle.select(1)  -- Assuming torches are in the first slot
            turtle.turnRight()
            turtle.dig()
            turtle.place()
            turtle.turnLeft()
        end
    end
end
 
-- Return to the initial location and drop all items
function returnAndDropItems(length)
    -- Turn around 180 degrees
    turtle.turnRight()
    turtle.turnRight()
    for i = 1, length do
        turtle.forward()
    end
    -- Drop all items
    for slot = 2, 16 do
        turtle.select(slot)
        turtle.drop()
    end
end
 
-- Main program
print("Enter the desired tunnel length:")
local length = tonumber(read())
 
-- Dig the tunnel
digTunnel(length)
 
-- Return to initial location and drop items
returnAndDropItems(length)