The Energy Transition in the Sea seminar held in Rio de Janeiro focused on decarbonizing Brazil's maritime sector. Led by Admiral Ilques Barbosa Junior, the seminar introduced the Brazilian Maritime National Action Plan (BMNAP), aiming to steer investments in ship technology, alternative fuels, and port infrastructure. The BMNAP proposal, set for discussion in the Federal Senate, aligns with international decarbonization targets and emphasizes collaboration across industries. The International Council on Clean Transportation (ICCT) highlighted the value of such a plan, advocating for renewable fuels and improved fuel efficiency in the maritime industry. The seminar also addressed challenges in prioritizing investments due to technological uncertainties. A case study on the Cape Jasmine, a bulk carrier, analyzed energy demands and costs of liquid hydrogen, ammonia, and methanol on a shipping route, showcasing the potential for these alternative fuels. Despite challenges like storage limitations and toxicity concerns, the analysis suggests promising cost competitiveness for renewable alternative fuels by 2030. Collaboration among stakeholders, including cargo owners, ship operators, and fuel providers, is key to driving the maritime sector's clean energy transition. With the BMNAP nearing completion, Brazil is positioned both as a collaborative leader in the maritime industry and a supporter of global decarbonization efforts.