Answer: He fished it out
Explanation:
Maori legend states that Maui hid in a canoe in order to go fishing with his four brothers who had wanted to leave him behind. He then revealed himself to them and when they started fishing, he used a magic fishhook which he made from the jawbone of an ancestor to fish.
He caught something huge and when he pulled it out expecting a huge fish, he instead saw a huge island which became the North Island of New Zealand. This is why the island is called 'Te Ika a Māui' (Māui’s fish). His brothers then carved out parts of the land creating mountains, valleys and rivers amongst other natural formations.