A further 13 workers have suffered suspected carbon monoxide poisoning while working overnight in the Channel Tunnel, making 32 in two nights.
http://www.bbc.co.uk/news/world-europe-25914801
The 13 were taken to hospital in France after working overnight to replace track, following 19 the previous night.
Although carbon monoxide poisoning is the suspected cause, operator Eurotunnel says it has not detected excessive levels.