Lost City Raiders (2008 TV movie)
starring James Brolin, Ian Somerhalder, Jamie Thomas King, Ben Cross, Bettina Zimmermann
The year is 2048, and global warming has flooded much of Earth's land areas. A father and his two sons try to salvage treasures from sunken buildings when they are given an important assignment by the New Vatican.
IMDb review excerpt:
Best bit: When the cardinal portentously reveals the Triptych and we see that, when Moses parted the Red Sea, he was wielding the Sceptre of Osiris... So, it follows that whomsoever finds the scepter can reverse the rising waters!