Here is a concise summary of the provided transcript:
**Title:** Driving a Custom-Built, Amphibious Humvee Tank Underwater
**Summary:**
* The hosts, Chase and Graham from Prodigy TV, showcase a custom-built Humvee tank that can drive underwater.
* Initial tests involve driving the tank in shallow water and up steep hills, with success.
* The team then prepares for a deeper underwater dive, making modifications to ensure the vehicle remains waterproof.
* With scuba gear in place for the occupants, they attempt to drive the tank 10 feet underwater across a lake.
* Despite initial concerns and a sudden rainstorm, the team successfully completes the underwater drive **four times**.
* The video concludes with excitement and gratitude, encouraging viewers to check out Prodigy TV's channel.
Here are the key facts extracted from the text, each with a number and in short sentences:
1. **Vehicle Description**: The vehicle is a custom-built Humvee tank.
2. **Underwater Capability**: The Humvee tank can drive completely underwater.
3. **Initial Test Depth**: The initial water test was not at full underwater depth.
4. **Steep Hill Test**: The vehicle was tested on one of the steepest hills at the Team Raw House.
5. **Depth Measurement**: The team measured the water depth to ensure it was at least 10 feet deep.
6. **Mud Consideration**: The team accounted for "squishy mud" in their depth calculations.
7. **Snorkel Extensions**: The vehicle needed snorkel extensions to reach deeper depths.
8. **Maximum Initial Depth**: Without extensions, the deepest point they could reach was about the initial test depth.
9. **Risk of Getting Stuck**: If the vehicle failed, it would need to be lifted out with a crane due to locked tracks.
10. **Scuba Gear Usage**: The team used scuba gear to breathe while driving underwater.
11. **First-Time Scuba Diving**: One of the drivers (Graham) had never scuba dived before this underwater drive.
12. **Underwater Driving Depth**: The team aimed to drive about 10 feet underwater.
13. **Vehicle Modifications**:
* Extended air intake to prevent water entry.
* Extended exhaust to prevent water pressure on the engine.
* Sealed engine components (e.g., weatherproof dipstick, oil cap).
* Vented power steering and transmission through a high-placed hose.
14. **Weather Conditions**: The final attempt was made during pouring rain and thunder.
15. **Outcome**: The team successfully drove the tank underwater four times.