user: Question: Who was the opponent at the game attended by 70,012?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 13, 1999', 'Miami Dolphins', 'L 38–21', '75,623']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Attendance" = '70,012';