The confusion regarding "Season 10" and "deep paper" likely stems from the series' episode structure or specific guide materials:
You may be thinking of the official insider fan guide, Outer Banks: Pogue Life . This book is styled as a scrapbook and includes "deep" lore like secret pages from Big John's journal and insights into local legends. Status of the Series Outer Banks - Season 10
The finale of Season 1 is titled "The Phantom". It features a high-stakes sequence where the main characters hatch an illicit scheme to investigate a deep-sea mystery involving a shipwreck nearly 1,000 feet down. The confusion regarding "Season 10" and "deep paper"
The creators always envisioned a five-season journey and have known what the final scene would be from the beginning. Outer Banks - Season 10