• Small groups in the submarine, with at most 10 people aboard and 15 minutes inside, on a ticket valid only for its set day
• Free museum entry on Fridays, though the submarine still needs its own ticket
• Free English audio guide through the Moviguide app, so bring headphones and a charged phone

The Naval Museum in Gdynia tells the story of the Polish Navy from 1918 to joining NATO, with a modern permanent exhibition, models of old sailing ships, and an armory of real naval guns, torpedoes and sea mines, many taken from Polish warships.

Next to it sits ORP Sokół, a Norwegian-built submarine that served until 2018. Kids can step inside the 47-meter hull that carried a crew of 21.