About Exhibition UDT - Undersea Defence Technology 2026 will be held from 14th - 16th June 2026 at Excel in London, England, United Kingdom. This is the 37th dedicated exhibition and conference on underwater defence and security community. It brings together professionals from the military, industry and academia to focus on the cutting edge technologies and developments within one of the harshest environments known to man. It is the perfect opportunity to learn about the latest developments, network with key decision-makers, and explore new business opportunities.