sand

local checkPlacingBlocks = turtle.getItemCount(16)

function dig() -- Will dig the quicksand if detected
    if turtle.detectDown() and turtle.digDown() then
        sleep(0.5)
    end
end

function digLine() -- Will dig a line(3 blocks) of quicksand
    for i = 1, 2 do
        dig()
        turtle.forward()
    end
    dig()
end

function turnRight() -- Turns and moves the turtle
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()
end

function turnLeft() -- Turns and moves the turtle
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()
end

function digLayer() -- Will dig a layer(9 blocks) of quicksand
    digLine()
    turnRight()
    digLine()
    turnLeft()
    digLine()
    turtle.turnLeft()
    turtle.turnLeft()
end

function digAll() -- Will dig all(27 blocks) the quicksand
    for i = 1, 2 do
        digLayer()
        turtle.down()
    end
    digLayer()
end

function fillLine() -- Will fill a line(3 blocks) of quicksand
    for i = 1, 2 do
        turtle.placeDown()
        turtle.forward()
    end
    turtle.placeDown()
end

function fillLayer() -- Will fill a layer(9 blocks) of quicksand
    fillLine()
    turnRight()
    fillLine()
    turnLeft()
    fillLine()
    turtle.turnLeft()
    turtle.turnLeft()
end

function returnOrFill()
    if checkPlacingBlocks > 26 then
        print("Cleaning up the mess")
        turtle.select(16)
            for i = 1, 2 do
                fillLayer()
                turtle.up()
            end
        fillLayer()
        turtle.select(1)
    else
        for i = 1, 2 do
            turtle.up()
            for i = 1, 2 do
                turtle.forward()
            end
        turtle.turnRight()
        end
    end
end

-- Actual program

term.clear()
term.setCursorPos(1, 1)
print("Digging quicksand")
turtle.select(1)

digAll()
returnOrFill()

print("Done!")