These Familiars Are Strange - Chapter 61: Underwater dungeon

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

Draven is a magic professor in a fantasy world. He is also an earl, notorious for his evil deeds and mistakes since youth. His downfall is due to a curse that hinders his intellectual potential and his talents. Eventually, he becomes a villain, losing everything he holds dear: his siblings, fiancée, house, domain, and more. After a miserable death, he reincarnates in the modern world as Dravis Granger.In his new life, he grows up to be a highly intellectual individual oblivious towards his previous life, becoming a young professor in mechanical engineering and a researcher. However, he harbors a strange obsession with creating a game, fueled by vivid imaginings of another world. This obsession leads him to develop a game that mirrors his previous life. Upon completing his virtual reality world, he regains his past memories. Overwhelmed by intense emotions—rage, sadness, and the realization of his past ugliness—he suffers a fatal heart attack.In his final moments, he hears a voice, seemingly from the world itself, offering him a chance to return to his original fantasy world. However, he would only retain the memories of his modern life, not those of his first life’s mistakes. He agrees and is reincarnated once more, this time with the knowledge of a modern mechanical engineering professor.But one thing about the Dravis Granger, he's not just a mechanical engineer professor. Not just a straight, killer genius professor. He has his ideals, and the world is too full of villains for his great idealism. So he strived, with his great mind, he became a mastermind. But not as a villain, but as a person who has lost hope in police and justice, and decided to help the people by his own hand. Collecting victims and invited those handpicked talents to his side, making several insane stunts, assassinating, trapping, and eradicating the scums from the world.But now in this fantasy world, he has to survive from multiple factions trying to kill him, protect his domain, protect his siblings, protect his fiance, and the most important thing.Protect the world.But he hadn't lost the Dravis from the modern world.As a professor at the morning, an earl at the afternoon, and a dark knight at the night._____________________________“You've hurt my student.” Draven stands still, no mana seems to emit from him, but just a single frown. A frown that is enough to make the room's heavy. “As a teacher, you think I would leave you unpunished?”“You seem to think that I care about your position, Prince Hermit. But believe me,” Draven took a slow step. “Not even your father could protect you from me.”

Kieran was just an ordinary part-timer — a high school dropout who had also given up on boxing. With no parents and no real family, he survived by working his ass off every day. He was raised by a man he believed to be his father, but later discovered he wasn't — though the man passed away before the truth could fully sink in. What Kieran didn’t know was that he was actually the sole heir to a powerful business empire, the hidden son of a wealthy tycoon.

A person from Earth reincarnated in the One Piece world and became a Celestial Dragon, the noblest and highest status in the One Piece world, but not just any Celestial Dragon, but also a direct descendant of Em, who had the qualifications to become a king.With the vast resources and power he had over the world, he thought his only goal was to gather beautiful princesses and queens to become his maids and at the same time destroy Luffy in this life and take over the World Government.But he did not expect to awaken the Two-Hole Gate, a gate that allows him to go to one world after another. After conquering those worlds, he can merge them into the Pirate World.In the Zombie World of Doomsday, captured zombies are used as a workforce, and the perfect version of the virus is developed to improve the power of the World Government!World Hokage, Ninja Conquest, Obtaining the Rinnegan, Tenseigan, Ruling the Otsutsuki Clan and Changing It into the World Government Fanatics!Shinigami.Fairy Tail.One World after another has been conquered.The pirate world has also become more diverse...--------------------Hello guys hope you like the novel, the novel is not mine but I translated it and also I removed all the Chinese bullshit and toxins and made adjustments to it and added adult scenes in the novel so if you don't like that don't read it.Note: To clarify, English is not my mother tongue so be lenient with me I did my best. Also if you like it don't forget to put it in your library and give a five-star review and thank you.