It was famous because, once a year, thousands of one-celled plants bloomed at once, so that the sea became green-tinted. South of the Algae Sward were the Seascape Mountains, a range of underwater peaks and home of whaladons. Eventually, the Nullifier-5 was found to be leaking toxins that could potentially poison the entire Sward. Specialists were called in to prevent the ecological disaster in the making.