Threeillegaldrugdealerslaunchedoutonavoyageinahomemadesubmarine.Thesubmarineworkedwellinitially,butitstartedtomalfunction.Inattemptingtoreducetheweightsomehow,theywereinvestigatingthecargosectionwhentheydiscoveredayoungfemale,Reina,hiddenthere,andshelookedappalling.Asthesituationgetsworse,thetensionsamongthethreemenareheightened,andinthemidstofthis,Reinaattemptstoescape,butshehasnowheretogointheendlessopensea.
Withanunusualsettingofthesubmarine,wherenothingcanbeseenotherthanthehorizon,Submersiblecapturesthetensionoftheconflictsbetweenthecharactersandtheirstruggleforsurvival,whilethesubmarineenvironmentitselfarousesextremeclaustrophobiaandanxiety.ThetopstarfromColumbia,NataliaReyes,whoattractedtheworldwidefilmindustry’sattentionwithCiroGuerra’sBirdsofPassage(2018),andmadeherHollywooddebutinTerminator:DarkFate(2019),onceagaindrawsattentioninherroleasReina.(JinPARK)