Zena Halpern is an expert in ancient seafaring and a historian who helped them. They ended up dating the map at about 1647. It had the words “valve,” “anchor,” and “hatch” on it, suggesting that the hidden treasure might be from Africa.
The treasure hunters also found what appeared to be one section of a book. It seemed like a bookbinder, something that held paper together. Therefore, the brothers thought there could be manuscripts that were waiting to show their secrets to the bigger picture.