One Perfect Day (S05E13)

Title: One Perfect Day Plot: The crew of HMAS Hammersley faces a crisis as they scramble to thwart a terrorist plot targeting a crowded Australian harbor. Simultaneously, Kate and Dutchy uncover a scheme involving the smuggling of materials for a radioactive 'dirty bomb' via illicit fishing vessels. As tensions rise, Mike is taken aback when he learns that SAS Officer Jim Roth has asked Kate to marry him—forcing Mike to confront the reality of losing the woman he cares for to another man.