This guide will let you know how to scan the drones in Grineer Sealab (Natah Gear Requirement).
To scan the drones, you need to equip the codex scanner in your gear slot.
You can find the drones on almost all maps in Uranus (grineer sealabs). The best place is Ariel since it’s only a capture mission and easy to encounter the drones.
You don’t have to complete the mission yet. Keep running around the map; you will be given audio and a visual cue (blue flashing lights and weird sounds) when the drones are near.
Sometimes they appear early on the mission, sometimes in the middle or after the mission is complete.
Here is the cue/sign.
They look like this and will spawn near the initial sign just walking around. They spawn in a pair.
You can also hear weird noises coming from them if you are near enough.
If you find them, never go near them as they will fly away. Just keep a safe distance to scan and complete the mission and extract.