Linda Park poses as Dr. Light and pretends to kill the Flash to lure out Zoom in episode 2x06 "Enter Zoom".
Vandal Savage arrives in Star City and kills a police officer and the ship's crew in episode 2x08 "Legends of Today".
Oliver and the Yamashiro family are heading to their boat to Japan when they are attacked by ARGUS agents in episode 3x15 "Nanda Parbat". Oliver says goodbye to Tatsu before catching a boat in episode 3x23 "My Name Is Oliver Queen".
Laurel attacks Malcolm Merlyn in revenge for Sara and they are both attacked by Guild of Assassin members in episode 3x15 "Nanda Parbat".
Oliver, Anatoly, and the other Bratva search the docks for signs of Kovar's activity and find a shipment of nerve gas in episode 5x17 "Kapiushon".
Oliver fights Alex Faust who is trying to launch a missile at the city in episode 6x01 "Fallout".
Dinah and Diggle search a warehouse for clues on Black Siren's plan in episode 6x01 "Fallout".
Oliver and the team head to an old dockyard to rescue the kidnapped CEO from Anatoly in episode 6x02 "Tribute".
Liv distracts the guard while the other members of the underground rescue the humans trapped in a shipping container in episode 4x06 "My Really Fair Lady".
Frank heads to the docks to talk with Little Jay about the upcoming deal in pilot episode. Frank returns to convince Little Jay to turn himself over to the police in episode 1x02 "Signal and Noise".
Shawn ransacks the supplies of the fence El Proveedor looking for his stolen engagement ring.
Billy McGoldrick waits at the pier for everyone and then takes them on a boat to Alcatraz.