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.
Si ce labyrinthe devenait inextricable, l'appareil s'élevait alors comme un aérostat, et l'obstacle franchi, il reprenait sa course rapide à quelques mètres au-dessus du fond.