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After Gooigi opens the final gate, Goobs with shark fins will attempt to pop Luigi's raft. After the water is drained, Luigi can use burst to remove their swim gear and capture them. There is a pipe next to a malfunctioning light that Gooigi can go through after using the Suction Shot on it. It leads to a submarine where Gooigi can make the purple gem appear by lighting a stove with a piece of burning wood. The water must be drained before doing this.