20000 Leagues, in 2007 and 2008, was a partner of the Argonauta NGO from Murter in the Kornati archipelago research. Research has made a significant contribution to knowledge of biodiversity of species and habitats of this important marine protected area.

The mapping project of habitats of gorgonians has mapped areas of white, yellow and red gorgonia during 2008 and 2009. The mapping was carried out on the Kornati archipelago and in the area of Rogoznica in the middle Adriatic, and around the island of Rab, Prvic and Goli otok in the northern Adriatic.

The quadrant methodology serves to count the number of colonies, and the surface coverage of other species

In the bay of Brninjšćica on the island of Dugi otok, special for its biological and geological features, biospeleological research was conducted in 2009 and 2011.

In cooperation with the Public Institution “Nature Park Telašćica”, a monitoring program of the Posidonia oceanica meadows, an important infralitoral habitat, was carried out during 2009, 2010 and 2011.

20000 Leagues was a partner to the Biology Student Association – BIUS in 2010 in the project of inventorization of macrozoobenthos and mapping of marine habitats in the Novigrad Sea.

Biospeleological research was carried out in 2010 on a submerged speleo-object on the uninhabited island of Drvenik near the island of Zlarin.