The master is relieved of all liability :
a) in the case of an offence referred to in article 424,2°, below, if he proves that he has fulfilled all his supervisory duties or if the offender is discovered ;
b) in the case of an offence referred to in article 424,3°, below, if he can prove that serious damage required the ship to be diverted and on condition that these events were recorded in the logbook before the visit by the customs service.