A possible concise summary is:
In this vlog, Carter and Carl test two RC boats to see which one is faster and which one can drive underwater like a submarine. They use rocks and flex tape to modify the boats and try different angles and depths in a swimming pool. They have fun racing and diving the boats, but they also damage them and encounter some technical issues. Carter also announces that he is coming out with a movie and asks the viewers to comment and subscribe.
Here are some key facts extracted from the text:
1. The text is a transcript of a video where Carter and Carl test two RC boats in a swimming pool and try to make them go underwater like submarines.
2. The two RC boats are a white and green one with a regular DC motor and a yellow one with a brushless motor.
3. The yellow boat is faster than the white one on the surface, but it also flips over more easily and gets water inside.
4. The white boat looks more like a submarine and can go underwater for a short distance, but it loses signal when it goes too deep.
5. Carter adds some rocks to the white boat to make it sink more and uses flex tape to seal the yellow boat to prevent water from getting in.
6. Both boats manage to go underwater for a few seconds, but they also hit the bottom of the pool and damage their noses.
7. Carter mentions that he is coming out with a movie and that Project Zorgo is watching.