CREATE TABLE table_11764007_2 (week_arrived_on_main_island VARCHAR(255), original_tribe VARCHAR(255), week_sent_to_third_island VARCHAR(255))
What week did the member who's original tribe was shark and who was sent to the third island on week 14 arrive on the main island?
    
SQL: SELECT week_arrived_on_main_island FROM table_11764007_2 WHERE original_tribe = "Shark" AND week_sent_to_third_island = "14"