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在华仔的巨星演唱会上，麦兜与他的伙伴们齐声高歌，硬邦邦的城市在华美耀眼的灯光下渐渐融化…… 时光倒转， 春田花花幼儿园因不堪沉重的经济压力而被迫组建了“春田花花合唱团”，那个傻里傻气又活在梦中的校长率领着一群初出茅庐的小朋友，开始了一段磕磕绊绊的音乐之旅。 他们唱过没有人的商场，录过一夜爆红的广告金曲，遇到过骗钱跑路的胶牌经理人，甚至还受邀在葬礼上献歌一曲……鲜花、掌声、坚持、泪水，直到校长重新遇见了年轻时的自己，直到春天花花幼儿园被改建成了豪宅，直到岁月的痕迹慢慢爬上额头……当校长的头发日渐稀疏，当那颗咬了一个学期的糖炒栗子终于有了裂缝，每个人心中都泛起了一种叫“感动”的情绪……笑容从山那边落下，明天还会升起吗？。Marine scientist Fred Miller designs the world's first underwater home, but when the business magnate funding his work threatens to end the project, Miller volunteers to live in it with his own family to prove it's practical. The underwater clan includes his water-phobic wife and his daughter and son, who are part of a rock and roll band. They bring along the lead singer and drummer. Along the way, they have to contend with a competing engineer who promises to mine the ocean floor for the businessman. A record producer likes their music and books them on TV, leading the kids to try to escape to the surface.。