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We're Treasure Hunters was a virtual representation of one of Kassandra's genetic memories, relived by Layla Hassan through the Portable Animus HR-8.5.
Kassandra reached near the ruins, finding a pod of sharks around it. After killing the sharks, she dived into the ruins, opening a chest and recovering the artifact. She resurfaced and approached Obelia, which arrived with her ship docked nearby.
Obelia:My friend, you are a gift from Poseidon himself.
Kassandra:I try my best.
Obelia:I'm going to need that artifact from you now.
Kassandra:First, my pay.
Obelia:I don't think so.
Kassandra:Very funny. Now pay up.
Obelia:The last laugh is all mine... I'm in the business of double crossing mercenaries.
Kassandra:I didn't swim through sharks for this.
Obelia:That was your mistake, not mine.
Kassandra:You fucking traitor.
Obelia:Now, now. Let's not make it personal.
Kassandra:I do your dirty work, and you don't pay me? It's personal.
Obelia:Look on the bright side - I'm allowing you to walk away with your life.
Kassandra:There was no treasure.
Obelia:Then why are you here?
Kassandra:I came to tell you there's nothing there. Someone else must have got there first.
Obelia:Then I'll kill you and check your remains, just to be sure.
Obelia and her crew attacked Kassandra. However, they were easily defeated and killed by her.
Kassandra:Deal's off. Now I'll kill you for wasting my time.
Obelia:You haven't got a chance. Take him out!
Obelia and her crew attacked Kassandra. However, they were easily defeated and killed by her.
Outcome
Kassandra was betrayed by Obelia, who demanded the artifact in exchange for her life. It is unclear if Kassandra handed it over without a fight or slew the entirety of Obelia's ship for her betrayal.
Trivia
Despite her betrayal, Obelia can be knocked unconscious, so long as the final hit comes from unarmed attacks, Spartan Kick, or Paralyzing Arrows, and hired on as a lieutenant for the Adrestia.
Obelia's ship will persist offshore for quite a while. This makes it an easy mark for the "Sink (2) bandit ships" requirement of Recruitment Drive.