digtunnel

local tArgs = { ... }
if #tArgs ~= 1 then
    print( "Usage: digtunnel <length>" )
    return
end

-- mine just enough for a person
local size = tonumber( tArgs[1] )
local pos = -1
-- its -1 to fix the position... it will technically mine one too far

turtle.up()

while pos < size do
    turtle.dig()
    turtle.digDown()
    turtle.forward()
    pos = pos + 1
end

-- return
while pos > 0 do
    turtle.back()
    pos = pos - 1
end