From typicallyspanish.com

Canarias
Two electrical workers die when overcome by fumes
By h.b.
May 15, 2008 - 4:39 PM

Two workers have died after falling into a four metre hole in Tenerife and being overcome by toxic gas. The two were carrying out electrical maintenance work on a transformer in the Güímar industrial estate when the accident happened just before noon today.

The fire service had to be called for the bodies to be recovered.