Passage du Gois is a submersible causeway in the Bay of Bourgneuf, linking the island of Noirmoutier to the mainland in the department of Vendée, in France. Twice a day, for an hour or two, the tide goes out and the causeway becomes visible and accessible to traffic. For the rest of the day, it remains flooded under 1.3 to 4 meters of water and cannot be used.
Though sometimes people still get caught between the tides, but luckily there are elevated rescue towers for people to climb and wait to be rescued.
Image credits: h1apn
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