▁quote ▁lines ▁of ▁the ▁' A ene id : ▁this ▁detail ▁makes ▁possible ▁that ▁the ▁bas il ica ▁hous ed ▁a ▁school , ▁mentioned ▁by ▁late ▁sources ▁about ▁the ▁Tra jan ' s ▁Forum ▁and ▁the ▁Forum ▁of ▁August us . ▁ ▁Bibli ography ▁ ▁Fil ipp o ▁Co arel li , ▁Gu ida ▁ar che olog ica ▁di ▁Roma ' ', ▁Ver ona , ▁Arnold o ▁Mond ador i ▁Edit ore , ▁ 1 9 8 4 . ▁ ▁Category : Build ings ▁and ▁structures ▁completed ▁in ▁the ▁ 2 nd ▁century ▁Argent aria ▁Category : R u ins ▁in ▁Italy <0x0A> </s> ▁The ▁He cht ▁( G erman : ▁" P ike "), ▁also ▁known ▁as ▁Type ▁XX V II A , ▁was ▁a ▁two - man ▁all - elect ric ▁German ▁m idget ▁sub marine ▁created ▁during ▁World ▁War ▁II . ▁ ▁History ▁The ▁origin ▁of ▁the ▁He cht ▁began ▁with ▁the ▁salv age ▁of ▁the ▁two ▁British ▁X ▁class ▁sub mar ines ▁ ▁and ▁ ▁which ▁had ▁been ▁s unk ▁during ▁Operation ▁Source , ▁an ▁attempt ▁to ▁sink ▁the ▁German ▁batt les hip ▁Tir p itz . ▁Haupt amt ▁Krieg sch iff bau ▁subsequently ▁produced ▁a ▁design ▁for ▁a ▁two - man ▁sub marine ▁based ▁on ▁ins pection ▁of ▁the ▁British ▁boats , ▁designated ▁Type ▁XX V II A ▁and ▁named ▁He cht ▁(" P ike ") ▁ ▁Like ▁the ▁British ▁X ▁class ▁boats , ▁the ▁Type ▁XX V II A ▁was ▁designed ▁to ▁carry ▁explos ive ▁charges ▁to