CREATE TABLE table_8844 ("Year" FLOAT, "Ship" CLOB, "Departed From" CLOB, "Departed On" CLOB, "Returned On" CLOB)

When did TDB depart?
SELECT MAX("Year") FROM table_8844 WHERE "Departed From" = 'tdb'
SELECT MAX("Year") FROM "table_8844" WHERE "Departed From" = 'tdb'