The overall theme of UDT 2019 is “Total defence: undersea defence and security in a deteriorating global environment”. Sweden’s Defence Policy 2016-2020 establishes the Swedish approach to the deteriorating global security environment. It highlights that the underwater environment and specifically anti-submarine warfare (ASW) is an area in which Sweden is investing. Other nations are responding to the declining international environment in similar ways. The 2019 show will also host the Military Diving Conference, which was launched in 2018 to great acclaim. Focusing on the unique challenges of diving under hostile conditions, this two-day conference will share the latest technological developments aimed at improving the effectiveness, efficiency and safety of military divers across the spectrum of dive operations.