Deep Fission, an advanced nuclear energy company, has initiated its roadshow for an underwritten public offering of 6,000,000 shares of common stock, with an option for underwriters to purchase an additional 900,000 shares. This marks a significant milestone as the company's first public offering, aiming to fund its development of underground small modular pressurized water reactors. Specific financial targets and investor details for this offering have not yet been disclosed in the provided text.