In the Breach Executable mission there are Planetary Assimilation Pistons* that can spawn in, generally one each after Waves 1 and 2. * They look like this: https://cdn.oneesports.gg/cdn-data/2024/06/Destiny2_Planetary_Assimilation_Piston-1-1024x576.jpg Using your Hammer on these Pistons will release a number of crystalized Radiolaria deposits that can be gathered (they are shared among the group so no need to fight over them) which can in turn be deposited near Failsafe at the end of the Activity or within the HELM to get rewards and progress various Triumphs. As the Pistons tend to spawn near already existing Radiolaria deposits, equipping a resource detection mod to your Ghost will help you to locate them more easily. (΄◉◞౪◟◉｀)