O'Connor first wrote about Oak Island as a young journalist in 1969, returned repeatedly across the next two decades, and in 1988 published The Big Dig: The $10 Million Search for Oak Island's Legendary Treasure (Ballantine), the book that became the contemporary baseline. The 2004 Lyons Press edition is a substantive revision: chapters on the Triton Alliance excavations, the work of Dan Blankenship and David Tobias, and the geotechnical findings of the 1990s are added or expanded, and the closing chapters bring the search up to the eve of the Lagina acquisition.
What separates O'Connor from earlier writers is access. Over thirty years of reporting he conducted long interviews with most of the principal searchers of the post-1960 era, including Mel Chappell, Bob Restall before his death, Robert Dunfield, Dan Blankenship, David Tobias, and Fred Nolan. His archive of correspondence, field notes, and photographs, donated to the Chester Municipal Heritage Society as the D'Arcy O'Connor Fonds, is itself a primary research collection.
Strengths: the human portraiture is sustained and precise; the chronology of post-Truro searches is the most reliable available outside the engineering reports; the book treats theories without committing to any. O'Connor neither boosts nor debunks the major hypotheses, leaving the reader the work of weighing them.
Limits: the 2004 edition is now twenty-two years old and pre-dates the Lagina-era discoveries that have transformed the public conversation. Some early-period details O'Connor accepted on the authority of earlier writers, particularly around the McGinnis discovery and the inscribed stone, have since been challenged by closer reading of the primary sources. A 2018 update closes some of these gaps but is itself catching up to a fast-moving search.
For researchers, the book is the second volume to consult after Sullivan, and on the modern era of the search it is in some respects the more reliable of the two.
What this source documents
The 1795 discovery and the early companies through the 1860s; the Oak Island Association and the first death; the Treasure Company period under Frederick Blair; the Hedden, Hamilton, and Restall searches; the August 1965 Restall deaths; Robert Dunfield's 1965-1966 excavations; the founding and operations of Triton Alliance under David Tobias and Dan Blankenship through the 1970s, 1980s, and 1990s; the work at Borehole 10X; Fred Nolan's parallel investigation and the dispute over Lots 5 and 9 to 14; the legal and corporate history of the island leading up to the 2006 sale to the Lagina partnership.
Why it matters
The standard contemporary single-volume reference for the post-1960 search before Sullivan's 2018 book replaced it on most reading lists. O'Connor's interviews with the principal searchers of that era are unique to him, and where the show or later writers cite an account of a specific recovery or expedition between 1965 and 2000, the trail usually leads back to The Big Dig or this 2004 revision. The D'Arcy O'Connor Fonds at the Chester Municipal Heritage Society, donated by the author, contains the field notes and correspondence behind the book and is now the principal archival source for the modern era of the search.
