On 13 March 2020, the second bore of the LBT was temporarily closed to all traffic following the discovery of ingress by both water and sand while remedial work was performed to address this. In addition to cleaning the tunnel interior, removing the sand and excess water via suction, and the flushing out of its drainage system, temporary steel tanks have been installed in the bore with regular inspections of the tunnel with a particular focus on this issue. Furthermore, solutions to prevent reoccurrence in the long term have been identified and are to be compiled into a plan for approval by the Federal Office for Transport during late 2020; if approved, sections of the LBT shall be modified accordingly. On 27 April 2020, it was announced that the LBT had been fully reopened.