TwentyThousandLeaguesUndertheSeaisaclassicsciencefictionnovelbyFrenchwriterJulesVerne.ThenovelisaboutthefictionalCaptainNemoandhissubmarinewhichisseenbyoneofhispassengers,ProfessorPierreAronnax. 　　Thestorywaswrittenbeforemodernsubmarineswereareality.ItisdescribledbyProfessorPierreAronnax,amarinebiologist,whowasaccompaniedbyhisfaithfulassistantandbyaCanadianharpoonernamedNedLand.Asthestorybegan,amysterious"seamonster",wasseenbyshipsofseveralnations;anoceanlinerwasalsodamagedbythecreature.TheUnitedStatesgovernmentfinallyassembledseveralshipstotrackdownanddestroythemonster.SinceAronnaxhappenedtobeinvitedtogoalong,andheaccepts.Afterwards,theshipsfoundthe"monster"andhadabattle.Theexpeditionwasdefeated,andAronnaxwassavedbythe"monster". 　　Theirtravelstookthemtoalotofpointsintheworld'soceans.AndthetravelerswitnessedtherealcoralsoftheRedSea,Atlantisandothersceneries.WhentheyreturnedtotheAtlanticOcean,agroupofgiantsquidattackedthesubmarine,andkilledacrewmember.Nemofellintodeepdepression,andallowedthesubmarinetosink.Thisgavethethreeprisonersanopportunitytoescape;theymadeitbacktolandalive,butthefateofCaptainNemoandhiscrewwasnotknowed.