The event is ["Clear Broken Spit of the Risen sea creatures replicating themselves" ](https://wiki.guildwars2.com/wiki/Clear_Broken_Spit_of_the_Risen_sea_creatures_replicating_themselves ""Clear Broken Spit of the Risen sea creatures replicating themselves" "). The event has been bugged with no sign of progression, the relevant enemies are all already dead. Screenshot: https://imgur.com/UW6X4BA Would really appreciate this event from being bugged so I can progress with my Treasure Hunter achievement.