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The Hydro-Pack was an upgrade to Clank which allowed him to swim more easily, with jets on his sides.
The gadget was already equipped on Clank at the start of Ratchet & Clank (PS4).
The Hydro-Pack could be enabled by holding R1. 
- Ratchet & Clank (2002) (first appearance of original Hydro-Pack)
- Ratchet & Clank (PS4) (first appearance)