Day 60: Halfway to History!
Grant Romundt Other
Today, we celebrate an extraordinary milestone: Day 60 of our journey to break the record for the longest continuous stay underwater in a fixed habitat! We’ve officially reached the halfway point, and this moment marks much more than just a numerical achievement, it’s a powerful testament to human ingenuity, resilience, and the boundless possibilities of […]
New Underwater Air Tank test
Grant Romundt Construction Lifestyle
Today, I’m testing out some new gear. I’ve got a mission to tackle, some new gear to test, and a camera ready to capture it all. Let me take you through my setup and the plan for this dive. First things first: my primary source of air is the hookah rig, powered by a compressor. […]
Friends, adventure and underwater surprises
Mariaan Jacobs Community
With the halfway point of Rudy’s 120-day Guinness World Record attempt for living underwater fast approaching, a surprise visit from old friends was just what the doctor ordered. The visitors? Longtime friends and owners of Linton Bay Marina, who took a boat ride across the open sea to check in on their friend and share […]
Underwater Record: Witness Setup
Mariaan Jacobs Other
As Rudiger Koch embarks on his world record attempt for the longest time living underwater, ensuring that everything is properly monitored is crucial to maintaining the integrity of the challenge. To meet the strict requirements set by the Guinness World Records, a well-coordinated witness system has been established. This includes both liveaboard and remote witnesses […]
Q&A with Dr. Javier Garrido
Mariaan Jacobs Lifestyle
As the world watches the possibilities of ocean habitation unfold, Rudy has reached an exciting milestone: the completion of the first quarter of his 120-day underwater living challenge. Living 11 meters beneath the ocean surface, presents unique demands on the body and mind, which are closely monitored to better understand the effects of such an […]
Doctor check-up and biomarkers explained
Mariaan Jacobs Other
Rudy Koch, Chief Engineer at Ocean Builders, is undertaking a 120-day underwater living challenge, offering doctors a unique chance to study human adaptation to prolonged underwater habitation. By tracking specific biomarkers, indicators of how the body responds to conditions and treatments. This journey offers groundbreaking insights into epigenetics, biological age, and how our environment shapes […]
Free Cities Conference: Liberty in our Lifetime
Mariaan Jacobs Other
The recent Liberty in Our Lifetime conference was an inspiring and successful gathering of visionaries and changemakers from across the globe, all driven by a shared mission: to reshape governance, urban life, and sustainability through innovative Free Cities.Held at the elegant Empire Hall in Prague’s historic city center, the event served as the heartbeat of […]







Ocean Builders on The Official Concept Podcast
Mariaan Jacobs Other
We’re thrilled to share that Ocean Builders was recently featured on The Official Concept Podcast, a platform renowned for its deep-dive conversations with influential individuals in luxury, innovation, and sustainability. This episode was no exception, offering a riveting exploration of underwater living, sustainability, and the future of ocean habitation. Join host Allan Campbell as he […]