Engineers examining why the cracks appeared in the Gotthard Road tunnel are exploring the possibility they could have been caused by the tunnelling for the second tunnel, which is due to open in 2029.
Work on the new tunnel has been suspended.
Last month the existing tunnel was closed briefly after slabs fell from the ceiling.
Experts told the SonntagsZeitung newspaper it may be necessary to increase the distance between the tunnels which would delay the planned opening.
Confusion over US tarifs
Switzerland is weighing its response after the US Supreme Court struck down much of Donald Trump’s tariff regime.
Possible new Iranian meeting in Geneva this week
The Iranian foreign minister says there could be a new meeting with the American delegation in Geneva to discuss their nuclear program.
Driver tackles tunnel fire in Geneva
A young man is being praised for his bravery after he tackled a fire in the Vernier tunnel on the A1 just outside Geneva on Friday afternoon.
Avalanche claims another life
A 22-year-old skier has died in an avalanche in Verbier.
Now hairdressers charge for no-shows
No-shows are becoming an escalating problem for Swiss businesses.
Cat cancer may help humans
Researchers at the University of Bern say genetic changes in cat tumours closely mirror those seen in human breast cancer - a discovery that could open new paths for treatment.
