turtle.refuel()
print("Refueled turtle!")
while turtle.getFuelLevel() >= 1 do
    turtle.forward()
    if turtle.detect() then
        turtle.dig()
    end
    if turtle.detectDown() then
        turtle.digDown()
    end
    while turtle.getItemCount(turtle.getSelectedSlot()) >= 0 do
        turtle.select(turtle.getSelectedSlot() + 1)
    end
    turtle.placeDown()
end