Deepflow Rifts are cosmic signatures that can be 'fished' with tractor beams to dredge up items.
Finding a Deepflow Rift
Deepflow Rifts are Level 1 Combat signatures that appear in both K- and J- space as well as Pochven. Upon warping to the signature Aura will inform you that a Deepflow Abyssal rift has been detected.
Getting loot
Targeting the rift with a Tractor Beam has a chance to generate a Deepflow Cargo Container in space. These containers can have Blue Loot, Red Loot and other rare items. While in the site, Tractor Beam auto-cycling is disabled, so they need to be manually activated each cycle. The site can generate up to 21 Canisters in High-sec, 27 in Null-sec and Wormholes, and 33 in Low-sec and Pochven, indicated by a tracker, and will expire after 18 minutes, also tracked on screen. Additionally, an indicator is present for stability, and if too many Tractor Beams are activated on the Rift in too short a period of time, a small Rogue Drone force spawns.
There is also a bonus payout for retrieving all containers from the Rift.

Changes
2025-01-30 - Deepflow Rifts returned: https://wiki.eveuniversity.org/UniWiki:Patch_Notes/Patch_Notes_-_Version_22.02#Deepflow_Rifts 2025-02-05 - Number of canisters now scales with system security: https://wiki.eveuniversity.org/UniWiki:Patch_Notes/Patch_Notes_-_Version_22.02#PVE_4 2025-03-19 - Rift timer increased from 15 to 18 minutes: https://wiki.eveuniversity.org/UniWiki:Patch_Notes/Patch_Notes_-_Version_22.02#Drifter_Crisis 2025-05-15 - Spawn frequency updated and rewards and enemies updated: https://wiki.eveuniversity.org/UniWiki:Patch_Notes/Patch_Notes_-_Version_22.02#Nexus_Reckoning