S01E03: The Discovery of a Wrecked Ship

Moomin and his friends go mountain climbing, encounter a very depressed Hemulen, sunk in gloom because his stamp collection is finally complete and he has nothing more to collect They learn from him about a sailboat wrecked on the beach. They start repairing the boat, hoping to sail the seven seas. Deciding to start collecting plants instead, Hemulen gets over his depression, and they all go for a trial sail.