Railroad to Mars, with Halen Mattison (CEO of General Galactic)

Halen Mattison left SpaceX because Elon told him his vision was too long-term. He wanted to build the propellant infrastructure that would unlock Mars and everything between here and there, but the timeline didn't fit SpaceX's roadmap. So he started General Galactic to do it himself. His team is developing Genesis, a water electrolysis propulsion system that delivers hydrazine-level thrust and xenon-level efficiency using the safest, cheapest, most abundant propellant in the solar system. The company is targeting an orbital demonstration in 2026, with a long-term vision to operate refueling depots from LEO to Mars. Inside the episode: • Why the space industry's fear of new technology is creating a sitting-duck opportunity How water electrolysis unlocks both near-term mobility services and long-term ISRU infrastructure What "specific impulse" actually means for mission economics and why it matters more than people think The Starship refueling challenge and why cryogenic propellant depots will work at scale Sequencing from mobility-as-a-service to lunar fuel production to gas stations on Mars Why consensus-following investors miss the most ambitious bets and how to tell the contrarian story • Chapters • 00:00 – Intro 01:11 – When did Halen decide to start his own company? 02:18 – What did Halen do at SpaceX? 02:59 – Deciding moment to devote to a career in aerospace 05:16 – The current state and trajectory of Starship 07:53 – What is General Galactic building? 09:50 – General Galactic's products and end goals 12:12 – General Galactic's perspective shift on mobility in space 16:31 – Architecture vs the current market offerings 21:39 – Why is now the time to build a water electrolysis system? 24:27 – Genesis 25:42 – Hardware in space 26:19 – What would a General Galactic demonstration mission look like? 27:13 – What would product 1 look like? 28:15 – Mission capability unlocks and cost advantage 30:56 – Offering a service 31:27 – Origin and evolution of General Galactic 34:59 – Space companies that sequence well outside of SpaceX 36:06 – 4-year prediction if mobility gets adopted 38:39 – Misunderstandings about Starship's refueling logistics 42:01 – Where would General Galactic fit in the Starship ecosystem? 43:25 – What a v0.1 Mars gas station would look like 44:46 – How difficult is it to protect General Galactic's position with water electrolysis? 46:22 – Lessons from being a founder 49:30 – Sequencing • Show notes • General Galactic’s website — https://gengalactic.com/ Halen’s socials — https://x.com/HalenMattison Mo's socials — https://twitter.com/itsmoislam Payload’s socials — https://twitter.com/payloadspace / https://www.linkedin.com/company/payloadspace Ignition’s socials — https://twitter.com/ignitionnuclear / https://www.linkedin.com/company/ignition-nuclear/ Tectonic’s socials — https://twitter.com/tectonicdefense / https://www.linkedin.com/company/tectonicdefense/ Valley of Depth archive — Listen: https://pod.payloadspace.com/ • About us • Valley of Depth is a podcast about the technologies that matter — and the people building them. Brought to you by Arkaea Media, the team behind Payload (space), Ignition (nuclear energy), and Tectonic (defense tech), this show goes beyond headlines and hype. We talk to founders, investors, government officials, and military leaders shaping the future of national security and deep tech. From breakthrough science to strategic policy, we dive into the high-stakes decisions behind the world’s hardest technologies. Payload: www.payloadspace.com Ignition: www.ignition-news.com Tectonic: www.tectonicdefense.com