Trainee divers with the Baltic Sea Divers face their final exams on two real jobs rather than a classroom test. One crew attempts to reforest seagrass meadows in the Baltic Sea, the underwater plant beds that act as a major carbon sponge and have been dying off for decades. Another team suits up for an urgent ferry inspection, running a complex class survey before a job to replace a damaged echo sounder cable goes wrong underwater. The film follows the divers through briefings, gear checks, and descents into cold, low-visibility water, showing examiners watching for the small procedural mistakes that separate a pass from a fail. Footage stays close to the actual work: rope lines, hand signals, surface support crews tracking air and time, and the tense radio chatter when the cable job stalls. Rather than narrating diving as a skill in the abstract, the episode treats it as a trade with exams, deadlines, and consequences, set against the specific ecological stakes of a shrinking seagrass ecosystem.