In2016,ayoungAustralianfilmmakerbegandocumentingamateurinventorPeterMadsen.Oneyearin,MadsenbrutallymurderedKimWallaboardhishomemadesubmarine.Anunprecedentedrevelationofakillerandthejourneyhisyounghelperstakeastheyreckonwiththeirowncomplicityandpreparetotestify.
