function mine()
    for i = 1, 15, 1
    do
        turtle.dig()
        turtle.forward()
    end
end

function turnR()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
end

function turnL()
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.turnLeft()
end

function layerMine()
    for i = 1, 7, 1
    do
        turtle.refuel()
        mine()
        turnR()
        mine()
        turnL()
    end
    mine()
    turnR()
    mine()
    turtle.turnRight()
    for i = 1, 15, 1
    do
        turtle.forward()
    end
    turtle.turnRight()
    turtle.digDown()
    turtle.down()
end

for i = 1, 16, 1
do
    turtle.refuel()
    layerMine()
end