There are 4 types of missions. The rewards are random (see in Scientists page).

Difficult Duration Chance to die

(basic)

Mission name
Easy 30min - 2h 0 Sift Surface Dirt
Metal Detect Surface
Lidar Artifact Scan
Medium 30min - 2h 5-10% Explore Shallow Cave
Sift Crater Top Soil
Utilize Magnetometer At 40km
Hard 1h - 4h 25-50% Explore Lost Tomb
Excavate Crater
Dredge Groundwater
Nightmare 1h - 4h 40-95% Explore Deep Cavern
Excavate Ancient Cave
Excavate Deep Pit
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