Large ctenophores that look very much like Bolinopsis or Leucothea sp. (based on body shape and inner structure); Size (big) 6-10 cm, abundance: 3-4 m3 and more, almost in all water column; current: 1/4 knots from South; Water temperature: surface-15.8c, bottom 14c (dive computer); Wind: North breeze 8 knots; Sea condition: Flat; Bottom depth: 18m; Visibility: 50cm; Bottom type: sand (he)