Since the goal was to preserve seed varieties, naturally there wasn't a large quantity of each planted.
One must realize that although only two or three plants of each fruit variety were grown, the sum of all fruit and vegetable varieties was far from a small number.
Moreover, due to the flooding, obtaining suitable soil was exceedingly difficult.
Even though most survivors had begun practicing martial arts and their physical fitness had steadily improved—including their ability to withstand deep water pressure—
the soil from the deep water areas was not the same as the silt found in riverbeds.
If the silt in riverbeds could be considered a natural organic fertilizer, the seafloor's top layer had scarcely any soil, being mainly composed of gravel.
Such gravel, commonly seen in construction, is not suitable for the majority of plants to grow in.
