| Type | Experimental proto-submarine |
| Weight | Unknown |
| Designer | |
| Developer | |
| Build date | |
| Dimensions | Unknown |
| Propulsion | Divers rowing oars |
| Power source | Manual |
| Significance | Laid groundwork for future submarine advancements in the alternate timeline |
| Effectiveness | Ineffective in deeper waters |
| Notable features | Wooden hull • Pressurized cabin • Manual air pump |
| Operational status | Prototype, never produced |
