Const Que

//1st slot should be a bucket, 2nd slot should be a tank, 3rd slot should be an ender chest

t = turtle

function f()
    if t.detect() then
        t.dig()
        t.forward()
    else
        t.forward()
    end
end
function d()
    if t.detectDown() then
        t.digDown()
        t.down()
    else
        t.down()
    end
end

function refuel()
    if t.getFuelLevel() == 0 then
        while t.getFuelLevel < t.getFuelLimit() do
            pleaseRefill()
        end
    end
end
function store()
    if t.getItemCount(16) > 0 then
        pleaseStore()
    end
end

function pleaseRefuel()
    t.select(2)
    t.placeUp()
    t.select(1)
    t.placeUp()
    t.refuel(1)
    t.digUp()
end
function pleaseStore()
    t.select(3)
    t.digUp()
    t.placeUp()
    num = 4
    while num < 17 do
        t.select(num)
        t.dropUp()
    end
    t.digUp()
end
function checkers()
    pleaseStore()
    pleaseRefuel()
end

function quarry()
    x = 16
    z = 16
    while x > 1 do
        while z > 1 do
            checkers()
            f()
        end
        t.turnRight()
        f()
        t.turnRight()
    end
    d()
end

quarry()