It’s Season 2 episode, The Heist.

You and Kiara went down in the sewers to look for a gun that Ward murdered Gavin with that got washed away in the storm. Meanwhile, Pope and JJ stayed up (btw you and JJ are like a thing!). Also (later on) Rafe and Barry could hear you and they hated you and the rest. So they decided to kill you guys and flush the sewers out to drown you.