In a show transmitted over the Internet and satellite television, Argentine rocker Javier Calamaro went to 7m (23 ft) in a special capsule to play "underwater music" to mark the arrival of migrating southern right whales. Calamaro performed May 31st in Golfo Nuevo off the coast of the Valdes penninsula in Chubut province, where the huge marine mammals are known to be seen as they shift northwards to winter in warmer waters.

"This is underwater music. It is the first concert for both human beings and whales that I have heard of," Calamaro, brother of renowned composer and singer Andres Calamaro, said before performing his repertoire which included his own works, folk classics and Argentine tango. The musician performed solo for the 40-minute concert in his underwater capsule, which he transformed into a mini recording studio complete with computers and underwater cameras near the coast.

Hundreds of southern right whales travel between late May and December along the coast near Valdes penninsula -- a UNESCO World Heritage site -- to give birth to their calves, a spectacle which draws some 100,000 tourists per year. The whales can be seen either from beaches or aboard tourist boats authorized for whale watching.