The morale of 33 miners trapped in Chile soared after music and hot meals were supplied, while Nasa advisers praised their “courage” and provided advice on daylight deprivation, as a rescue drill inched closer.

Drilling was paused on Wednesday afternoon to shore up the new shaft’s wall with cement, after a minor geological fault was detected in the rock, the rescue operation’s chief engineer Andres Sougarret said.

A new video shot by the miners and broadcast on state television late on Tuesday showed the men shaven, wearing clean clothes and listening to a tropical tune.

The figures in the images were a far cry from the haggard, mud-caked, bare-chested miners shown in a first video last week, days after they were located by a probe drill.

The miners have now spent 27 days in the San Josè mine in northern Chile, which collapsed on August 5.