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Hydrogen is a resource and viable fuel in KSP 2. As a fuel, it is used exclusively by hydrogen-burning nuclear engines, such as the LV-N "Nerv". It is the lowest density fuel available, requiring significant amounts on a vessel to generate large amounts of Δv.
List of all the hydrogen engines currently in KSP2:
| Part | Size | Tech Tree Tier |
|---|---|---|
| LV-N "Nerv" | SM
|
2 |
| LV-SW "SWERV" | LG
|
3 |