Miner Luis Ulloga assists in the rescue effort at the San José gold and copper mine where 33 workers have been trapped for 25 days. (Ariel Marinkovic/AFP/Getty Images)

SANTIAGO, Chile – “I'm sending my greetings to Angelica. I love you so much, darling,” Osman Araya said to the camera as his voice broke and tears rolled down his cheeks. “Tell my mother, I love you guys so much. I'll never leave you; I will fight to the end to be with you.”

The 33 miners’ second video, this time filled with messages to their loved ones, was an emotional testament to what they’ve endured trapped a half-mile below the surface. Shirtless and wearing surgical pants sent to keep their skin dry, the miners sent messages of hope, love and longing to their family and friends on Aug. 29.

Rescuers installed a hydraulic bore that will drill a rescue tunnel to free 33 trapped miners. (Ariel Marinkovic/AFP/Getty Images)

“Following the euphoria of being discovered, the normal psychological reaction would be for the men to collapse in a combination of fatigue and stress,” said Dr. Rodrigo Figueroa, head of the trauma, stress and disaster unit at the Catholic University in Santiago, London’s The Guardian reported.

The stranded men, who have spent a record-breaking 25 days in the collapsed San José gold and copper mine in Copiapó, face the task of helping in their own rescue effort, dubbed by Chilean President Sebastián Piñera “Operation San Lorenzo” in reference to the patron saint of miners. The drilling started on Aug. 30.

A relative of one of the trapped miners carries flowers during a religious ceremony at the San José gold and copper mine in Copiapó. (Ariel Marinkovic/AFP/Getty Images)

“The miners would have to clear all the debris as it falls,” said André Sougarret, an engineer of state-owned mining company Codelco in charge of the rescue effort.

The miners would have to divide themselves into teams of six, working 24-hour shifts during two months to complete the operation, Sougarret told Chile’s El Mercurio. They are expected to remove between 3,000 and 4,000 tons of rock, The Associated Press and The Guardian reported.

The miners are trapped in a 50-square-meter safety zone within the San José mine, where the temperature is between 32 and 36 degrees Celsius (89 to 96 F), the Chilean government said.

Chilean Health Minister Jaime Manalich said that four officials from the U.S. National Aeronautical and Space Administration (NASA) have arrived to assist in the rescue effort.

James Michael Duncan, Deputy Chief Medical Officer at Johnson Space Center in Houston, Texas, Albert Willard Holland, a specialist in psychology, James Polk, Chief of the Division of Space Medicine and Clint Cragg, a specialist in logistics and engineering have arrived on site to help the rescue teams, according to El Mercurio.