| Title | : | Submarines – Extreme Technology – Big Bigger Biggest |
| Duration | : | 46 minutes, 20 seconds |
| Uploader | : | Element 18 |
| Added On: | : | 17 June, 2022 |
| Views | : | 13.0M times |
| Likes | : | 0 |
| Source | : | YouTube |
At 171 metres long, the USS Pennsylvania is the biggest submarine in the US Navy. It can dive deeper than a thousand feet, sail for 20 years without refuelling, and remain submerged for up to 6 months. The vessel carries a crew of 155 men and a deadly n
