Nikumaroro — formerly known as Gardner Island — is a remote, uninhabited coral atoll in the Phoenix Islands of Kiribati, roughly 7.5 km (4.7 mi) long by 2.5 km (1.6 mi) wide, with dense tropical vegetation surrounding a large central marine lagoon. It sits in the western Pacific Ocean, south of Howland Island, the destination Amelia Earhart and navigator Fred Noonan never reached on July 2, 1937. The atoll is now part of the Phoenix Islands Protected Area, a 425,300-square-kilometer marine reserve declared by Kiribati in 2006 and expanded in 2008 — one of the largest marine protected areas in the world. It is the central focus of the TIGHAR (The International Group for Historic Aircraft Recovery) hypothesis, which holds that Earhart and Noonan may have landed here as castaways after missing Howland Island. Gates traveled to investigate two parallel theories in the season-one premiere of Expedition Unknown, with Nikumaroro representing the atoll-castaway theory alongside a competing hypothesis centered on Papua New Guinea.
Amelia Earhart and Fred Noonan disappear during their circumnavigation attempt; Nikumaroro lies south of their intended destination, Howland Island
British colonial settlement established on Nikumaroro (Gardner Island), occupied intermittently until the colony was abandoned
British colonial officer Gerald Gallagher discovers 13 partial human bones on the island, believed by some to possibly be Earhart's remains; the bones are shipped to Fiji and subsequently lost
Kiribati declares the Phoenix Islands Protected Area, encompassing Nikumaroro; expanded in 2008 to 425,300 km²
Gates investigates the Nikumaroro castaway theory in Expedition Unknown S01E01, "Amelia Earhart"
The TIGHAR hypothesis — that Earhart and Noonan survived a crash landing on Nikumaroro's reef and died as castaways — has attracted serious academic attention alongside considerable skepticism. According to Wikipedia, trace artifactual and osteological evidence 'more consistent with the presence of a Euro-American woman castaway on the island than with other known prior inhabitants, or prior castaways, has emerged,' but no conclusive evidence of her plane or her presence specifically has been confirmed. The aluminum panel that TIGHAR researchers identified as potentially matching Earhart's Electra 10E represents one of the more examined physical claims in the case, though independent experts have disputed whether the match is definitive.
The 1940 bone discovery by Gerald Gallagher remains one of the most tantalizing and frustrating threads in the Earhart mystery. Gallagher, a British colonial officer on the island, found 13 partial human bones he believed might belong to a woman of European descent — a description consistent with Earhart. The bones were sent to Fiji, examined at the time, and subsequently lost, meaning modern DNA analysis has never been possible. Some researchers who have re-examined the original forensic notes argue the skeletal measurements are consistent with Earhart; others maintain the methodology of the original analysis was too limited to support that conclusion.
Mainstream historians and aviation experts generally regard the Nikumaroro hypothesis as plausible but unproven — one of several credible theories alongside the possibility that the Electra simply ran out of fuel and ditched in the open ocean. The U.S. Navy conducted searches near Howland Island in 1937 and found nothing, and no subsequent expedition has produced a confirmed piece of wreckage. The site's location within the Phoenix Islands Protected Area adds logistical and regulatory complexity to any future investigation.
Gates' S01E01 investigation situates Nikumaroro within a broader two-theory framework — the atoll-castaway scenario versus a Papua New Guinea crash theory — without resolving either. The episode honestly presents the state of the evidence as Gates found it: suggestive, intriguing, and still frustratingly incomplete. That editorial honesty is consistent with where the research community itself stands: after decades of searching, Nikumaroro remains a compelling possibility, not a confirmed answer.
Nikumaroro is approximately 7.5 km (4.7 mi) long and 2.5 km (1.6 mi) wide — a small and easily overlooked speck in the vast central Pacific that nonetheless sits within plausible range of Earhart's last known position.
The Phoenix Islands Protected Area, which encompasses Nikumaroro, covers approximately 425,300 square kilometers (164,200 square miles) of ocean — making it one of the largest marine protected areas on Earth.
The 13 human bones discovered by British colonial officer Gerald Gallagher in 1940 were shipped to Fiji for analysis and subsequently lost, leaving open the question of whether DNA evidence could ever confirm or rule out an Earhart connection.
Nikumaroro has been known by at least two other names historically: Kemins Island and Gardner Island — the latter being the name in use during the colonial period when the 1940 bones were discovered.
Nikumaroro is extremely remote and uninhabited, located within the Phoenix Islands Protected Area of Kiribati; independent travel to the atoll is not practically feasible for general visitors and typically requires a research or expedition permit. Organized expeditions occasionally access the island for scientific or investigative purposes, but there is no tourism infrastructure on-site. Travelers interested in the Earhart mystery may find Tarawa, the capital of Kiribati, a more accessible starting point for learning about the broader Phoenix Islands region.
Tarawa (capital of Kiribati) is approximately 1,800 km (1,100 mi) to the northwest and serves as the primary administrative and transport hub for the region.
The central Pacific experiences relatively stable tropical conditions year-round, though the period from May to October is generally drier and considered more favorable for ocean travel. Any expedition to Nikumaroro should be planned well in advance given permitting requirements and the logistical demands of reaching such a remote atoll.
Part of the Phoenix Islands Protected Area (PIPA), a UNESCO World Heritage Site and one of the largest marine protected areas in the world.
Australian Outback
The Australian Outback has been linked to Earhart disappearance speculation and represents the same kind of extreme-environment mystery investigation Gates pursues across remote wilderness regions.
Indian Ocean
The Indian Ocean is another vast, deep-water setting where aviation disappearance mysteries — and the limits of search technology — echo the unresolved questions surrounding Earhart's final flight path.
Sky Caves of Nepal
Sky Caves of Nepal represents a similarly remote, permit-restricted site that Gates investigates for evidence of lost individuals and vanished histories, sharing Nikumaroro's theme of inaccessible landscapes holding potential answers.
Historical data sourced from Wikipedia