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The December 2025 issue of InDEPTH Magazine pushes to the very edges of what’s possible in exploration diving—politically, physically, scientifically, and historically—while honoring the legacy of Michael Menduno (1952–2025). This month, we open with “Inside Britannic: Permits, Politics, and the Physics of a 120-Meter Mission” where Richie Kohler, interviewed by Stratis Kas, offers an unfiltered account of discipline, logistics, and the realities of working a 120 m / 400 ft national monument. We then travel beneath the mountains of Mexico in “Beneath a Mountain: Inside the 2024 Beyond the Sump Uluapan Expedition” by Osama Gobara and Mauro Bordignon, capturing multi-day pushes, underground habitats, and exploration at the limit of human endurance.

In “Eight Hours at 1.3: How Science Caught Up with the Way We Actually Dive,” Dr. Simon Mitchell, in conversation with Stratis Kas, reshapes our understanding of oxygen exposure with a landmark update grounded in the latest research. Innovation continues in “The 2026 InDEPTH Rebreather Guide”—a sweeping annual review built on the work of Michael Menduno, Amanda White, Kenzie Potter, and updated by Menduno and Kas—covering every major backmount, sidemount, and frontmount unit in the field. We also debut “Blueprint for Success” by Jarrod Jablonski, a new series that blends performance, philosophy, and mentorship in tribute to Menduno’s enduring legacy.

The issue rounds out with “The Hidden Schooner: Unearthing History in the Depths of Lake Ontario” by Heison Chak and James Conolly, one of the most striking archaeological finds of the year, and “The Heretic Engineer: How Kevin Juergensen Rewired the DNA of Tech Diving Safety,” a rare deep-dive into the mind behind some of the field’s most influential life-support innovations. Alongside these features, readers will find our first Easydive-sponsored giveaway winner, fresh industry news, community calls, and a data-driven year-end look at diver rituals and habits.