There are 11 Oyashio class boats in service. They are 4000 tons submerged and 7750 shaft horsepower for a top underwater speed of 20 knots. They are larger than their predesesor boats, the "Harushio" class because of the need to put in place the flank sonar array. There is no AIP in place, just standard diesel electric. For a small island nation the japanese are definetely commited to a large modern fleet of subs.
There are OLD pilots and there are BOLD pilots but there are very few OLD BOLD pilots. MAG