[b]Submersion[/b] is listed as a possible (albeit still rare) reward from [b]Distorted Arms Week Engrams[/b]; as such it logically follows you should play any Activities that award the other listed drops (ie. Trachinus and Synanceia) which would likely be the [b]Arms Week: Hardware[/b] playlist. In addition you would do well to spend your Event Tokens to open [b]Distorted Arms Week Engrams[/b] from the Event Shop while trading your [b]Combat Telemetries[/b] earned from completing Activities for Engrams from Ada at the Shooting Range, assuming you aren’t hung up on only going for Tier 5 drops at the moment. And as a reminder, [b]Submersion[/b] will be Attunable during the final Event of [b]Ash & Iron[/b], [b]Call to Arms[/b], so you shouldn’t feel as though you have no choice but to burn yourself out grinding for drops before then. (΄◉◞౪◟◉｀)