Argo-Dome regroups different actions that will be lead in the frame of the doctoral project of Sergio Cambronero: “towards three-dimensional management of biodiversity hotspots in Areas Beyond National Juridictions”. The first objective is observational: set up a regional observation system of the Costa Rica Thermal Dome, via a network of BGC-Argo profiling floats maintained by the international Argo program. The second objective is technological: provide information on the soundscape via the development of an in-situ acoustic sensing capability, in the aim to characterise anthropic noise emitted by maritime traffic. The third objective is sustain this observing system in a long term perspective through collaborative actions in Costa Rica: scientific and technological capacity building with the Oceanographic Lab of UNA, outreach through the Adopt-a-Float program with ONG Pelagos, international visibility through media and artistic supports aligned with UNOC25 and BBNJ agreement.