A National Geographic Explorer's search for Cleopatra's tomb got a big breakthrough.

Kathleen Martínez has spent the last 20 years searching for the lost tomb of Cleopatra. Her work is part of a new Nat Geo special called "Cleopatra's Final Secret."

Martínez's theory is that because the Romans hated Cleopatra, the queen had her deceased body sneaked to the Taposiris Magna temple in Egypt through underwater tunnels for burial.

Her latest search took her and her team underwater where they discovered an ancient port submerged site miles offshore of Taposiris Magna in the Mediterranean Sea.

In the remarkable clip, seen in the video player above, Martínez called legendary National Geographic Explorer Bob Ballard, who discovered the Titanic, to share the news.

"I have a very big smile on my

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