大家一听，如果莽撞地去救人，搞不好还没有救到族人，就又被巴斯抓走了，可是那么多族人还关在密室里，时间拖得越久，他们的处境就会越困难。去救也不是，不去救也不是，大家都愁苦得说不出话了。
“你们看看这是什么？”悠悠说着，从身后拿出来了一个形状奇特的钥匙，形状非常特别，有点像八爪鱼，每个角都有明显的凸起。
“巴斯的钥匙！”见过钥匙得人鱼们都惊讶地叫了起来。
“你怎么会有巴斯的钥匙？”贝贝妈妈问道。
“还记得在密室的那次爆炸吗？”悠悠笑眯眯地说道，“那时巴斯没站稳，差点摔倒了，我扶了他一把，趁机把他的钥匙拿走了。”
“现在咱们有钥匙了，”义说道，“而且我们都去过密室，我们能记得路。”
“你们还记得第二次铃声响起来的地方吗？那里就是密室。”悠悠朝人鱼们说道，“到时候族长可以带领一队族人，利用鱼雷引开巴斯和他手下的渔人。我和小灵妖们到水晶宫的密室救人。另一队则趁渔人们不注意的情况下，在水晶宫底下埋鱼雷，如果渔人来了，就引爆这些鱼雷，让他们追不过来。”
“咱们现在开始吗？”仁问道，“外面正好刮大风，浪很大，这种天气下，巴斯是没有办法看到水里的东西的。”
“咱们要不要也带个鱼雷？如果渔人们来抓我们的话，咱们可以用呀。”勇抱着两个鱼雷说道。
小伙伴们一见到他紧张的样子，不禁都笑了。
“咱们用‘武器’吧。”智拿起了一个婴儿玩具，对人鱼们说道，“到时候你们听铃声，如铃声响起来了，就说明我们有危险，尽快引爆离铃声最近的鱼雷。”
“对了，有一点很重要，”悠悠提醒道，“水晶宫的楼梯很有问题，千万不要走中间，要走一定走两边！”
“好！”大家点了点头。听了悠悠的计划，大家突然都有了信心。
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半夜三更，天空乌云密布，狂风暴雨，大浪滔天。
离水晶宫很远的地方，突然“轰隆隆”一声巨响！
“发生了什么事？”巴斯放下了手里的“全世界最先进的武器”，走到窗前问道。
“好像是人鱼们又过来了。”一个渔人回答道。
“又来了？太好了，我正愁刚买的武器没地方用呢，今天正好试一试！”巴斯笑着说道，“水晶宫的武器都换好了吗？”
“是的，主人，都换上了最新的武器。”渔人回答道。
“很好。”巴斯说着，在身上装满“武器”，跟渔人们说道，“你们都带上这些武器，跟我一起去抓人鱼。”
看着巴斯和渔人们跳进海水里，越游越远，悠悠和小灵妖们赶紧朝水晶宫飘去。
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“Everyone listen， if we rush in and be reckless， we will all get captured. But if we stall， the longer and the higher chance of our relatives to get suffered. Any ideas?” the mayer asked in a slightly trembling voice. No one replied.
“Come， look at this.” Yoyo said while revealing something from his back. It was a shape of the stinky fish. Each side of the key had obvious similarities.
“Buzz’s key!!” All of the mermaids that knew it were stiff.
“How do you have Buzz’s key?” Bella’s mum asked in wonder.
“Remember the time when Buzz was about to fall and I saved him?”Yoyo said with a sly smile.“I pulled him up and took my opportunity to take his keys!”
“Now we have the key.”Yi said in joy，“Even better， we know the way to the chamber!”
“Do you remember the ringing of the bells the second time?”Yoyo asked，“That is where the chamber is.” Yoyo turned to the mermaids and said，“The mayor can lead the residents while some others can shoot water bombs to distract Buzz and his army. Me and my friends will sneak into the chamber and rescue the captured residents. When the guards are distracted， bury the bombs and wait until one of the guards come over. When this happens， explode the bombs.”
“Are we starting now?” asked Ren curiously，“the sky is very windy， Buzz won’t be able to see underwater.”
“Can we bring some water bombs? If the fishermen decide to catch us， we can use them for defense.” Yong said while holding two water bombs.
The demons could not help it but burst out in laughter.
“How about we use the ‘advanced weapons’.” Zhi said as he pulled out a toy.“We will go in with the toys and you mermaids wait. If you hear a ringing， that means we are in trouble and explode the closest water bomb.”
“Correct. But there is an extremely important detail.” Yoyo explained，“The stairs in the palace is very strange. Whatever you do， you must walk on the sides.”
“OK!” Everyone nodded. After hearing Yoyo’s recount， everyone had faith.
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Late night， the waves crashed and the thunder roared. The wind hailed as the sky frizzled and poped.
A long distance from the crystal valley， there was a giant “Boom”.
“What happened?” Buzz asked in wonder as he held one of his ‘world’s’ most advanced weapons’ and walked onto the balcony
“Looks like the mermaids declared war again Boss.” one of Buzz’s henchmen said.
“Are they now? That is good. I was starting to wonder where to put these weapons. Time to test them out.” Buzz said with delight.“Are all of the weapons loaded up?”
“They are Boss. We have loaded all of them.” Another one of his henchmen said.
“Very good.” Buzz said.“get ready， we will all take some and we will ambush those suckers along with the mermaids. Follow my lead. Don’t mess up or else. Got that? Good.”
As soon as Yoyo saw Buzz and others swim deeper in the water， he and his demons started to float their way to the crystal palace.
