Lieutenant Nicole "Nikki" (Nav) Caetano is a fictional TV character on the show Sea Patrol.
After a hostage situation aboard Hammersley (Takedown), Nikki starts to cool down as she admits she is happy to have him around, even though they can't be more than friends at that time.
In Birds, the Hammersley crew then encounter Campbell Fulton, a Marine Wildlife Officer who tries to force himself on Nikki, but she rebuffs him.
When Nikki learns that ET was poisoned by having his air supply sabotaged, She soon centers her investigation on Matt and Simone Robsenn, who are operating an oil theft ring.
To prevent word of their activities from reaching authorities, the Robsenns orchestrated the deaths of the dive team including ET, but it was Fulton who sabotaged their airways.