As recognized checking engineers, geotechnical and tunneling experts and experienced engineers in our fields, we review the designs of other companies in all planning phases on behalf of the client or approval authorities from a structural, tunneling, and geotechnical perspective. Using comparative calculations with our own software programs and drawing upon decades of experience, we are able to conduct thorough examinations and provide recommendations for optimization. In doing so, we contribute to the safety and cost-effectiveness of the structures.