A sinkhole roughly 8–10 m wide and several metres deep has opened on the AJ Burkitt Reserve sporting oval in Heidelberg, directly adjacent to the North East Link tunnel alignment in Melbourne’s northeast. Victorian Infrastructure Delivery Authority has confirmed the “surface hole” is in the vicinity of active tunnelling operations, leading to a work pause while engineers and emergency crews carry out geotechnical investigations and monitoring. No injuries or structural damage have been reported, but the area remains fully cordoned off pending cause determination and stability assessment.

A commuter train derailed in Gelida, near Barcelona, on 20 January after striking a collapsed retaining wall that had fallen onto the track, killing the driver and injuring 37 passengers. The incident, Spain’s second fatal rail accident in a week, occurred on a section of line with trackside earth-retaining structures, raising immediate questions over wall design, drainage, inspection frequency and slope stability under recent weather conditions. For civil and geotechnical engineers, failure mode identification and rapid condition assessment of similar retaining systems on active corridors will be a priority.

A construction crane collapsed onto a moving passenger train in northeastern Thailand on Wednesday morning, killing at least 32 people and injuring more than 60. The crane, operating on an adjacent construction site, failed and toppled across active railway tracks, striking multiple carriages at speed and causing extensive structural damage and derailment. Investigators are expected to focus on crane foundation design, ground conditions near the rail corridor, lift planning, exclusion zones and compliance with Thai standards for plant operating beside live transport infrastructure.