If the labyrinth became hopelessly tangled, the submersible would rise above it like an airship, and after clearing the obstacle, it would resume its speedy course just a few meters above the ocean floor.
Cuando el laberinto se hacía inextricable, el aparato se elevaba como un aeróstato y, una vez franqueado el obstáculo, recuperaba su rápida marcha a algunos metros del fondo.