Random triples
| Subject | Object |
|---|---|
| gptkb:Chunnel | conducted regularly |
| gptkb:Oslofjord_Tunnel | regularly conducted |
| gptkb:Øresund_Tunnel | regularly conducted |
| gptkb:transbay_tube | conducted regularly for safety |
| gptkb:Lötschberg_Base_Tunnel | conducted regularly |
| gptkb:Hampton_Roads_Tunnel | subject to regular inspections |