user: Question: What is the date that a Hell ship sunk in the East China Sea?
Columns: ['Estimate', 'Name', 'Nat.', 'Ship type', 'Where sunk', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['9,000', 'Wilhelm Gustloff', 'Germany', 'Cruise ship', 'Baltic Sea', 'Jan 30, 1945']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Where sunk" = 'East China Sea' AND "Ship type" = 'Hell ship';