This presentation will introduce D3TN, an innovative company at the forefront of developing delay and disruption-tolerant networks that connect challenging environments such as space and underwater. The session will cover D3TN's recent experiences with ESA's OPS-SAT nano-satellite, our interplanetary routing architecture developed as part of the Redmars project, and our long-term vision for underwater networking. Join us to explore D3TN's cutting-edge communication technology that will lift the limits of communication.