This year is a special year for the Ocean. The UN motto for World Ocean Day 2025 is ‘Wonder: Sustaining what sustains us’. The UN Ocean Conference (UNOC3) convenes from 9 to 13 June in Nice, co-hosted by France and Costa Rica. Mundus maris and its partners celebrate in Nice and several other places across three continents. Here the first activity for this year, others will follow soon.