At the edge of Araçá Bay and in the middle of the urban and industrial-port context of São Sebastião-SP (Brazil), a group of people lives in close relationship with the sea and its cycles, a place where they produce and reproduce socially. Recognized for their typical caiçara culture, they have lived since the 1980s with recurrent environmental problems and with the constant threat of port expansion over their territory. Pulsating: a film about the Araçá Bay reverberates through facts and testimonies the various voices that seek to translate the desire of the Araçá Bay and the life that pulsates there.