Overview

• Water on the roadway came from the tunnel’s bluswaterkelder, a reservoir kept ready for use in case of a fire.
• Two of three lanes toward Rotterdam were closed, causing roughly 9–10 kilometers of queue and delays of more than an hour.
• ANWB advised drivers to detour via the A59, A17 and A16 during the restrictions.
• Rijkswaterstaat later said the basin issue was resolved and indicated the tunnel could be fully open around 15:15.
• The reason the firefighting-water storage overfilled remains unclear based on initial reports.