Marco already has a name in mind - Titanic Dome. Completely unaware of any other water-based associations, he thinks stealthily naming it after Titans is a good choice. He agrees to look into more people who transform than just the people he knows, though he does let Olwen know the battle capabilities of the Colossal, Armored, Attack, and Jaw Titans. He also suggests maybe some scaffolding or buildings that smaller transformed people or humans with magical abilities could scale.

He thanks Olwen and promises to come back with any updates on special requirements or additional ideas!