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".
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.