minestairs

print("Loading Robust Turtle API...")
local load = os.loadAPI("t")
if load then
  print("Robust Turtle API loaded.")
else
 print("Robust Turtle API not found in the root directory with filename t")
 print("Attempting to download as t from pastebin...")
 os.sleep(2)
 local response = http.get("http://pastebin.com/raw.php?i= e0UksEtT")
 if response then
    print( "Success." )
    local sResponse = response.readAll()
    response.close()
    local file = fs.open( "t", "w" )
    file.write( sResponse )
    file.close()
    print( "Downloaded as t")
    load = os.loadAPI("t")
    if load then
     print("Robust Turtle API installed & loaded.")
    end
 else
    print( "Download Failed. Please Install Manually." )
    return
 end
end

--Mineshaft Digging Turtle. Places Torches every 6 blocks.
--Places Cobblestone when it does not detect blocks beneath it,
--creating bridges through caverns.  Use any frequently occurring
--block. Cobblestone not required, just a block that doesn't fall
--that your turtle will be mining plenty of.

print("place torches in slot 1 and cobblestone in slot 2")
print("dig down how far?")
local dist = t.readNum()
print("turtle fuel level is "..turtle.getFuelLevel()..", ok?")
read()

local torch =0
for i=1, dist do
 t.forward()
 t.digUp()
 t.down()
 if not turtle.detectDown() then
  t.placeDown(2)
 end
 torch = torch+1
 if torch == 6 then
  t.right()
  if not turtle.detect() then
   turtle.place(2)
  end
  turtle.up()
  t.place(1)
  t.left()
  t.down()
  torch = 0
 end
end
turtle.down()
for i=1, dist do
 turtle.back()
 t.up()
end
turtle.back()