Off-world: The Blade Runner Wiki
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Film Continuity

Cas and Pol were twin brothers who specialized in data decryption.

In 2039, Aahna Ashina asked the twins to decrypt a disk that originated from Alexander Selwyn's home. They found that it contained replicant research conducted by Selwyn and former Tyrell Corporation employees. This research involved creating multiple replicant copies of Selwyn's late wife Isobel, and the team was on the verge of attaining replicant fertility. The twin relayed this information to Ash once she paid them in fish.[1]