Section outline

    •  At the beginning of the development, our goal was to collect water at any depth. For this purpose, we prepared a transparent tube equivalent to the length of a third floor of a building, and investigated at what depth the water would enter the bottle. We hoped that by fine-tuning the shape of the water sampling port, we would be able to collect water from deeper depths with a subtle difference in pressure. However, it turned out that water could enter the bottle at a depth of about 1 m, and further adjustment was impossible. (So, it became a limited tool to collect water at a depth of 1 m near the shore.)