After arriving on Earth, the Immortal Men had never replaced a single component. This showed that the materials used to manufacture their parts were exceptionally durable and reliable, fully capable of withstanding tens of thousands of years of wear and use. The reverse-engineering and synthesis experiments conducted by Mars Foundry and the City of Immortals on Vibranium and the mysterious materials provided by the Emperor had created nearly all the advanced machinery of the City of Immortals and Latveria. Research into the Immortal Men might raise the technological standards of the City of Immortals and Mars Foundry once more.
Constantine was one of the few people in the world who knew what secrets lay buried beneath Mars. The mysterious materials and equipment acquired by Mars Foundry and the City of Immortals came from the oldest mechanical lifeforms in the universe. Even with the universe's most powerful mechanical mysteries in their possession, that did not mean Mars Foundry and the City of Immortals were capable of reverse-engineering every piece of equipment recovered from the Celestials. Faced with mechanical lifeforms so advanced they were nearly indistinguishable from magic, even though Mars Foundry and the City of Immortals had developed many mathematical tools and laws of microscopic physics, they could only imitate degraded versions of the technology.
Wakanda, which had likewise received some research materials, had not obtained many scientific achievements beyond those of the City of Immortals and Mars Foundry under its research agreement with the Emperor. The technology used by the Immortal Men might not be as advanced, but it was extremely suitable as a tool for developing the prerequisite mathematical tools, physical laws, and experimental methods needed for reverse-engineering the Celestials. It could greatly accelerate that work.
Constantine had specially authorized Epsilon-Rodney-Radium 223 to participate in the Immortal Man reverse-engineering