-- Turtle Cave Detector
-- Written by DiabolusNeil | CC 1.56
-- Requires: Mining Turtle

local bool = false
if turtle.detectDown() == false then
  while turtle.detectDown() == false do
    turtle.down()
  end
end

if turtle.digDown() == false and turtle.detectDown() == true then
  print("Turtle cannot dig down!")
else
  local num1
  local total = 0
  for i = 1, 16 do
    turtle.select(i)
    num1 = turtle.getItemCount()
    total = total + num1
  end
  if total ~= 0 then
    print("Clear the turtle's inventory!")
  else
    print("All ready to go! Excavating...")
    bool = true
  end
end

if bool then
  local level = 0
  while turtle.digDown() do
    turtle.digDown()
    level = level + 1
  end
  if turtle.detectDown() == true then
    for i = 1, level do
      turtle.up()
    end
    print("No cave detected below.")
  elseif turtle.detectDown() == false then
    for i = 1, level do
      turtle.up()
    end
    print("A cave has been detected!")
  end
end