▁un exp la ined ▁ocean ▁sounds . ▁ ▁See ▁also ▁Communic ation ▁with ▁sub mar ines ▁ ▁Ge oph one ▁Under water ▁ac oust ics ▁Son ar ▁Ref lection ▁se ism ology ▁ ▁Notes ▁ ▁References ▁ ▁Pi ke , ▁John ▁( 1 9 9 9 ). ▁S OS US . ▁Retrieved ▁January ▁ 2 8 , ▁ 2 0 0 5 . ▁ ▁Wat ling ton , ▁Frank ▁( 1 9 7 9 ). ▁How ▁to ▁build ▁& ▁use ▁low - cost ▁hydro ph ones . ▁() ▁ ▁Un known . ▁hydro phone . ▁Retrieved ▁January ▁ 2 8 , ▁ 2 0 0 5 . ▁ ▁Un known . ▁( 2 0 0 5 ) ▁Schl umber ger ▁O il field ▁G loss ary : ▁Term ▁' h ydro phone '. ▁Retrieved ▁January ▁ 2 8 , ▁ 2 0 0 5 . ▁ ▁O nd a ▁Corporation ▁( 2 0 1 5 ). ▁ ▁' H ydro phone ▁Hand book '. ▁ ▁Report ▁A IR ▁ 1 / 6 4 5 / 1 7 / 1 2 2 / 3 0 4 ▁- ▁National ▁Archives ▁K ew . ▁ ▁Air ship ▁H ydro phone ▁experiments . ▁ ▁External ▁links ▁▁▁ ▁D OS IT S — H ydro phone ▁introduction ▁at ▁Disc overy ▁of ▁Sound ▁in ▁the ▁Sea ▁ ▁or cas ound . net — Live ▁hydro phone ▁streams ▁from ▁k iller ▁wh ale ▁habitat ▁ ▁Pass ive ▁Ac oust ic ▁Mon itor ing — Using ▁hydro ph ones ▁to ▁monitor