Staircase

args = {...}
depth = args[1]

if type(depth) ~= "number" then
  error("The depth must be a number!")
end

turtle.up()
turtle.up()

for i = 1, depth do
  turle.dig()
  turtle.digDown()
  turtle.down()
  turtle.digDown()
end

turtle.turnLeft()
turtle.turnLeft()
for i = 1, depth do
  turtle.up()
  turtle.up()
end