unk ▁off ▁Est ep ona ▁ ▁B - 6 , ▁( 1 9 2 6 – 1 9 3 6 ), ▁s unk ▁by ▁re bel ▁destroy er ▁Vel as co ▁ ▁C - class ▁sub mar ines ▁ ▁Isaac ▁Per al ▁( C - 1 ), ▁( 1 9 2 8 – 1 9 5 0 ), ▁s unk ▁in ▁ 1 9 3 8 ▁and ▁rep a ired ▁after ▁the ▁Civil ▁War ▁ ▁C - 2 , ▁( 1 9 2 8 – 1 9 5 1 ), ▁fled ▁to ▁B izer te ▁after ▁the ▁March ▁ 1 9 3 9 ▁events ▁in ▁Cart ag ena ▁ ▁C - 3 , ▁( 1 9 2 8 – 1 9 3 6 ), ▁s unk ▁off ▁M ál aga ▁by ▁ ▁of ▁the ▁Naz i ▁Kriegs marine ▁during ▁Operation ▁Urs ula ▁ ▁C - 4 , ▁( 1 9 2 8 – 1 9 4 6 ), ▁fled ▁to ▁B izer te ▁after ▁the ▁March ▁ 1 9 3 9 ▁events ▁in ▁Cart ag ena ▁ ▁C - 5 , ▁( 1 9 2 8 – 1 9 3 7 ), ▁fate ▁unknown ▁ ▁C - 6 , ▁( 1 9 2 8 – 1 9 3 7 ), ▁s unk ▁ ▁D - class ▁sub mar ines ▁ ▁, ▁under ▁construction ▁in ▁Cart ag ena ▁ ▁, ▁under ▁construction ▁in ▁Cart ag ena ▁ ▁, ▁under ▁construction ▁in ▁Cart ag ena ▁ ▁Aer on á ut ica ▁Naval ▁ ▁The ▁Aer