Well, it depends on the specific story. Some 'phantom submarine' tales might be based on real submarines that were involved in covert operations. For example, during the Cold War, both sides had submarines doing secretive patrols and surveillance. If one side detected an enemy sub briefly and then lost track of it, it could be called a 'phantom submarine'. So in the context of a true story, it might be a real military sub.
A really cool submarine book is 'Voyage to the Bottom of the Sea' by Irwin Allen. It has a lot of exciting adventures and scientific exploration as the crew of the submarine Seaview faces various threats and mysteries. It combines action, science, and adventure very well.
It could be a lost or abandoned submarine. Maybe it was part of a military experiment that went wrong, and it's now drifting around, appearing and disappearing like a phantom.
There's no way to really tell if it's common specifically for someone named Jojo. However, in general, reading fanfiction is a popular activity among fans of many different franchises. The Jojo series has a large and dedicated fan base, so it's likely that there are fans named Jojo who partake in reading fanfiction, but we can't say for sure how common it is without more data.
Perhaps this Jojo is interested in exploring different interpretations and stories within the Jojo universe that fans have come up with. Fanfiction often takes the existing characters, settings, etc. from the original Jojo series and creates new and unique storylines. So, this Jojo might be a big fan of the series and wants to see what other fans have imagined.
" I Have a Water World, Fishing a Nuclear Submarine " was a completed novel by Ji Yu. This novel told the story of the protagonist owning a water world and obtaining various rewards by salvaging wreckage such as submarines. Other than that, there were other similar novels, such as Survival in the Deep Sea: The First Submarine and Treasure Hunt in the Ocean: The First Fighter.
Here are a few recommended novels about traversing submarines:
1. "Mechanical Ascension Begins from Becoming a Submarine": This sci-fi novel tells the story of a protagonist who transmigrated into a submarine and decided to go undercover to fight against a powerful enemy. This novel combined sci-fi elements with a story of rebellion. It was very interesting.
2. Survival in the Deep Sea: The First Submarine was a sci-fi/doomsday crisis novel. It told the story of a captain who transmigrated to the submarine world.
3. "Ghost Captain" was also a time-travel novel. It was about a modern man who traveled to another world to build his own submarine.
4. "My Creations Can Upgrade" was a science fiction novel. The protagonist could build various types of submarines and upgrade various creations through the number of views. It was very interesting.
5. Rise from the Red Sea was a military fantasy novel that might have submarine elements.
Please note that the novels recommended above may only be part of the relevant results. The specific content and quality may require further understanding.
The Hunt U429 was a movie about the German submarine U-429 at sea during World War II. The film told the story of the encounter between U-429 and the U.S. Navy's " Swordfish " at sea and a fierce battle. In the end, the Germans captured a group of American soldiers. However, the captain of the " Swordfish " contracted a serious infectious disease. In order to save the crew, the submarine captain decided to cooperate with the American captives and negotiate a landing in the United States to treat the disease. The movie was released in 2005.