 Some references simply assume all submarines numbered after SS-416 were "Tench" class; however, and were completed as "Balao"s. This yields 10 cancelled "Balao"-class, SS-353-360 and 379-380.The "Register of Ships of the U. S. Navy" differs, considering every submarine not specifically ordered as a "Tench" to be a "Balao", and further projecting SS-551-562 as a future class.This yields 62 cancelled "Balao" class, 51 cancelled "Tench" class, and 12 cancelled SS-551 class.