The summary is:
Three friends are building two underwater houses, one for one euro and one for one million euros. They are competing against each other and making fun of each other's creations. They also make references to Spongebob Squarepants characters and scenes. They use a lot of slang, insults and jokes. They have different styles and tastes in building. They also play a game of supreme battle with unfair weapons. They show off their houses and criticize the others. They end up arguing and insulting each other.
Here are the key facts extracted from the text:
1. A nuclear fusion reactor in South Korea achieved 100 million°C for 30 seconds.
2. The reactor's temperature was nearly seven times hotter than the core of the Sun.
3. The core of the Sun has a temperature of close to 15.7 million Kelvin.
4. The experiment marks a move from nuclear fusion being a physics problem to an engineering one.
5. A net energy gain was achieved in the nuclear fusion experiment.
Please note that these facts are based on the snippets provided and should be verified for accuracy with full context.