▁en larg ed ▁during ▁the ▁reign ▁of ▁Isabel ▁II ▁in ▁ 1 8 4 9 . ▁In ▁ 1 8 8 9 , ▁electric ity ▁was ▁introduced ▁into ▁the ▁ar sen al . ▁In ▁ 1 9 1 8 , ▁the ▁mo ats ▁of ▁the ▁dry ▁do cks ▁built ▁by ▁F ering án ▁were ▁developed ▁as ▁sub marine ▁do cks , ▁in ▁which ▁role ▁they ▁still ▁serve . ▁ ▁Sh ips ▁ ▁Gal erna - class ▁sub mar ines ▁ ▁Gal erna ▁ ▁M ist ral ▁ ▁Tr am ont ana ▁▁ ▁Seg ura - class ▁mine h un ters ▁ ▁Seg ura ▁ ▁S ella ▁ ▁Tam bre ▁ ▁Tur ia ▁ ▁Du ero ▁ ▁T ajo ▁▁ ▁Transport ▁ships ▁Martín ▁Pos ad illo ▁( owned ▁by ▁the ▁Spanish ▁Army ▁but ▁operated ▁by ▁the ▁Navy ) ▁ ▁El ▁Cam ino ▁Españ ol ▁( owned ▁by ▁the ▁Spanish ▁Army ▁but ▁operated ▁by ▁the ▁Navy ) ▁ ▁Pol ar ▁research ▁ships ▁ ▁B IO ▁H esp ér ides ▁ ▁Las ▁Pal mas ▁ ▁E W ▁support ▁ship ▁▁ ▁Al erta ▁ ▁Ch il reu - class ▁pat rol ▁vessels ▁ ▁Al bor án ▁ ▁Tar ifa ▁ ▁Des c ub ier ta - class ▁cor v ettes ▁▁ ▁Inf anta ▁El ena ▁ ▁Inf anta ▁Crist ina ▁ ▁Tor alla - class ▁pat rol ▁vessels ▁ ▁Tor alla ▁ ▁For ment or ▁ ▁Sub marine ▁rescue ▁ships ▁ ▁Ne pt uno ▁ ▁M ete oro - class ▁off sh ore ▁pat rol ▁vessel ▁