On April 7th, 2017 the Faculty of Science - University of Zagreb, organised the traditional Open day, where the whole institution takes part. The event called "The Biology Day and Night" is open to general public from children to elderly people. For that occasion the PMF Zagreb team, in collaboration with 20 students, organized several workshops and games, an exhibition of photos and a public lecture (presented by Silvija Kipson), to emphasize the relationships among marine organisms, highlighting the value of marine habitats, negative human impacts on them and potential for their restoration. During the event, PMF Zagreb used the opportunity to present their plans for marine restoration through the MERCES project. Following some pictures of the event.