▁ 1 9 1 8 , ▁R aff ae le ▁Pa ol ucci ▁and ▁R aff ae le ▁Ros set ti ▁of ▁the ▁Reg ia ▁Marina ▁rode ▁a ▁man ned ▁tor ped o ▁( nick named ▁M ign atta ▁or ▁" le ech ") ▁into ▁the ▁har bour ▁of ▁P ula , ▁where ▁they ▁s ank ▁the ▁batt les hip ▁Jug oslav ija , ▁of ▁the ▁n avy ▁of ▁the ▁State ▁of ▁Sloven es , ▁Cro ats ▁and ▁Ser bs , ▁formerly ▁the ▁Aust ro - H ung arian ▁batt les hip ▁, ▁and ▁the ▁fre ighter ▁Wien ▁using ▁lim pet ▁mines . ▁They ▁had ▁no ▁under water ▁breath ing ▁sets , ▁and ▁thus ▁had ▁to ▁keep ▁their ▁heads ▁above ▁water ▁to ▁bre at he . ▁ ▁They ▁were ▁discovered ▁and ▁taken ▁prisoner ▁as ▁they ▁attempted ▁to ▁leave ▁the ▁har bour . ▁ ▁In ▁the ▁ 1 9 2 0 s , ▁sport ▁spe arf ishing ▁without ▁breath ing ▁appar atus ▁became ▁popular ▁on ▁the ▁Mediter rane an ▁coast ▁of ▁France ▁and ▁Italy . ▁This ▁sp ur red ▁the ▁development ▁of ▁modern ▁sw im f ins , ▁div ing ▁mask s ▁and ▁sn ork els . ▁ ▁In ▁the ▁ 1 9 3 0 s ▁Italian ▁sport ▁spe ar fish erm en ▁began ▁using ▁industrial ▁or ▁sub marine - escape ▁o xygen ▁re bre athers , ▁starting ▁sc uba ▁div ing ▁in ▁Italy . ▁ ▁Unit ▁orig ins ▁ ▁This ▁new ▁type ▁of ▁div ing ▁came ▁to ▁the ▁attention ▁of ▁the ▁Reg ia