It had been Silena's idea for Percy and Annabeth's first date to be underwater. She'd told Clarisse the new developments of her extremely complex plan every day, to the point where it nearly drove the daughter of Ares to insanity, and Clarisse knew what that looked like.
But now, Silena was dead, and Clarisse felt she owed a debt to her best friend. So, the night after the war was over, she'd rounded up the counsellors, and dropped them in the lake.
"That's for you, Lena." She said to the sky after the drop.