CREATE TABLE table_3138 ("Week" FLOAT, "Date" TEXT, "Kickoff" TEXT, "Opponent" TEXT, "Final score" TEXT, "Team record" TEXT, "Game site" TEXT, "Attendance" FLOAT)

Who did Rhein Fire play Against where 30701 people attended?
SELECT "Opponent" FROM table_3138 WHERE "Attendance" = '30701'
SELECT "Opponent" FROM "table_3138" WHERE "Attendance" = '30701'