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Błotniak (Polish for "Harrier") is a one-man wet cabin underwater craft designed in Poland in 1978. It was based in the torpedo research centre in Gdynia (commonly called Formoza).

• propulsion:
  • two batteries of compressed air accumulators in the tubes on the sides of the craft
  • one set of ducted contra-rotating propellers
  • one electrical motor as a source of power for the propeller
• equipment:
  • two spotlights
  • 2 sonars (passive and active)
  • depth-levelling system
• maximum speed: 5 kn (9.3 km/h; 5.8 mph)
• range: 50 nmi (93 km; 58 mi)
• load capacity: 200 kg (440 lb)

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