DEFECTED: Ring-by-Ring Defect, Injection & Rectification Tracking for Tunnel Construction
DEFECTED is the audit-ready quality management system built exclusively for tunnel contractors. Track lining
defects, grout injections, and rectification works ring by ring, from any device, on any site, even without
internet.
Built for tunnel construction teams
DEFECTED replaces paper-based defect registers and spreadsheets with a purpose-built mobile app for
underground construction. Currently live on Sydney Metro.
Key features
- Ring-by-ring defect logging for tunnel lining inspections
- Injection tracking: record grout type, volume, pressure and location per ring
- Rectification management: assign, track and sign off remedial works
- Offline-first: works underground with no connectivity, syncs when back online
- Audit-ready exports: generate compliant reports instantly for client sign-off
- Real-time dashboards: live project quality overview for site and office teams
- Photo documentation: attach images to each defect or injection record
Case studies
Sydney Metro West, Portion 1: 3,158 defects imported from the issued DLP master defect list, with two tunnel
drives running concurrently on one shared register. Live in daily production since 6 July 2026.
Read the Portion 1 story.
Cavern joint and hose injection on a civil construction project, previously recorded on paper checklists.
DEFECTED was adapted to the work and was running on a phone underground five days after we started.
Who uses DEFECTED
Tunnel contractors, underground construction quality managers, site engineers, and project managers working on
metro rail, road tunnels, utility tunnels, and underground infrastructure projects.
Try DEFECTED free for 14 days
Start a free 14-day pilot on one heading. No credit card required. See how DEFECTED transforms your tunnel
quality process from day one.
Start your free 14-day trial at defected.app
Why tunnel defect tracking matters
Managing defects, injections and rectifications in tunnel construction is complex. Each ring must be
individually inspected, documented and signed off. DEFECTED makes this process digital, fast and audit-ready,
replacing the paper registers and Excel sheets that slow down tunnel quality teams.
Contact
Available at defected.app: the ring-by-ring quality system for tunnel contractors.