Airplanes occasionally crash into water but rarely in mid-ocean, where the uncharted bottom is dark and can be treacherous even for unmanned diving equipment.

• 飞机偶尔会坠入水中，但很少会坠毁在大洋中部，这里的海底状况未知，光线黑暗，即便对无人驾驶潜水设备来说也变幻莫测。