What are the names of the spacewalkers for end (UTC) October 30, 2007 15:53?
CREATE TABLE "table1_22385461_8" (
  "num" text,
  "spacecraft" text,
  "spacewalkers" text,
  "start_utc" text,
  "end_utc" text,
  "duration" text
);
SELECT "spacewalkers" FROM "table1_22385461_8" WHERE "end_utc"='October 30, 2007 15:53';