Greenpeace activists investigate the habitat of the endangered vaquita marina in the upper Gulf of California to locate illegal gillnets, which are contributing to the rapidly declining numbers of vaquita. This is despite the establishment of a marine reserve on April 10, 2015 by President Enrique Peña Nieto to protect the species, while securing the future of local fishermen in San Felipe and Santa Clara. The activists are working with local authorities to locate and decommission the illegal fishing nets. The clip includes footage of San Felipe locals joining the efforts to protect the vaquita using a hydrophone to monitor the endangered animal's activities.