stairDown

print("Remember to put fuel in slot 1 (top left)")

--check for fuel
function refuelCheck()
        if turtle.getFuelLevel < 100 then
            turtle.select(1)
            turtle.refuel(5)
        end
end

function stairDig(input)
    turtle.dig()
    turtle.forward()
    turtle.digDown()
    turtle.down()
    if input % 2 == 0 then
        turtle.turnRight()
    end
end

--MAIN

i = 0
while turtle.inspectDown().name ~= "minecraft:bedrock"
    if turtle.getFuelLevel() < 50 then
            print("Need refueling urgently!")
    else
        refuelCheck()
        stairDig(i)
        i=i+1
    end
end