Still Missing: Man's Desperate Search for Brother on Costa Concordia

Russel Rebello, a waiter on the Costa Concordia, is still missing. (Courtesy Kevin Rebello)

It's not just passengers who are still missing from the Costa Concordia disaster. Kevin Rebello is desperately looking for information on his brother, Russel Rebello, 33, a waiter on the ship from India who was last seen on a deck helping passengers to lifeboats.

Kevin told "20/20's" Chris Cuomo his story below. Russel Rebello, along with 22 others, has now been missing for 12 days.

Learn more about the Costa Concordia tragedy and go behind the scenes at cruises ships on "20/20: Cruise Ship Confidential."