Deep Engram Decoding

Deep Engram Decoding is the Sonar Station option for opening Deep Engrams during Season of the Deep (Season 21). Plain decoding turns one Deep Engram into a random piece of Season of the Deep gear. Focusing lets the player pick the result instead, and it costs Glimmer on top of the Deep Engrams.

Unlocking focusing

Armor focusing unlocks after a full set of Season of the Deep armor is obtained. Weapon focusing unlocks after six Season of the Deep or reprised Reckoning weapons are obtained, and it lets Deep Engrams be focused into weapons the player already owns. A further upgrade unlocks after both Salvage bosses are defeated.

This information comes from a 2023 guide for Season 21 and may have changed in later seasons.