local x, y, z = 17, 24, 16;
local this = turtle;

this.dig();
this.forward();
this.turnRight();

for i = 1, z do
    for i = 1, y/2 do
        for i = 1, x-1 do
            turtle.dig(); turtle.forward();
        end

        turtle.digUp();
        turtle.up();
        turtle.turnLeft();
        turtle.turnLeft();

        for i = 1, x-1 do
            turtle.dig(); turtle.forward();
        end

        turtle.digUp();
        turtle.up();
        turtle.turnRight();
        turtle.turnRight();
    end

    for i = 1, y-1 do
        turtle.down();
    end

    turtle.turnLeft();
    turtle.dig();
    turtle.forward();
end