The Nemean implant, also known as sub dermal armor, is a recurring element in the Fallout series which increases the player character's overall resistance to damage.
The following is based on Van Buren and has not been confirmed by canon sources.
In the cancelled Fallout title Van Buren, a series of unfinished Enclave/Poseidon projects were planned to appear, one of them being the Nemean implants. These were available for science-oriented characters to complete.
J.E. Sawyer's Fallout RPG[]
Nemean Armor Implants[]
Nemean Armor Implants increase the subject's Ballistic and Hard DTs by 5. This implant adds 10 lbs. of weight to the subject's inventory permanently.
Nemean Armor Implants, Stg. II[]
Stage II Nemean Armor Implants increase the subject's Ballistic and Hard DTs by 10. This implant adds 15 lbs. of weight to the subject's inventory permanently.