With a more investigative tone connected to civic reality, this version is narrated by Marina Marques, a 14-year-old who uses a diary format to document her discoveries about the coast. The e-book deepens the discussion on maritime heritage, linking scientific knowledge to social responsibility and the fulfillment of constitutional duties regarding environmental preservation.

Marina details the critical threats facing the Brazilian coast, such as inadequate sewage disposal, oil spills, and the lethal impacts of human activity on protected species, like the marine manatee. In the cultural dimension, the material explores the historical relevance of sambaquis (shell mounds) and fortifications (tangible heritage) and the importance of safeguarding traditions and artisanal techniques (intangible heritage) against the risk of "erasure" and forgetting. The focus is on youth mobilization, encouraging critical thinking, respect for the knowledge of elders, and active vigilance against vandalism and the degradation of national memory.