turtle.turnRight()
turtle.turnRight()
for i = 1,49 do
    if not turtle.forward() then
        turtle.dig()
        turtle.forward()
    end
end
turtle.turnLeft()
for i = 1,3 do
    if not turtle.forward() then
        turtle.dig()
        turtle.forward()
    end
end
turtle.turnLeft()
shell.run("tunnel","50")