F01W1–W10
Studies and definition
Oceanography, bathymetry, seabed, environmental scoping, route constraints and configuration selection.
Programme · 60×60
04 Programme
Seventeen months, five gates
Ten weeks of preliminary work and fifteen months of implementation, shown in relative months. No calendar start date, funding milestone or permit completion date is established.
Indicative sequence
Relative months from authorisation. Overlap, procurement lead times and seasonal survey windows must be integrated before any date is issued.
Bathymetry and current mapping. The survey defines what the design is allowed to assume. Cross section of the assembly concept. Calculations resolve dimensions, draft and load path. F02M2–M5Design and modelling
Transport and interaction modelling, structural and mooring calculations, navigation integration, draft specifications.
Alignment across the Cozumel Channel. Consultation and permits fix where segments may actually sit. F03M3–M6Approvals and consultation
Environmental assessment route, authority engagement, marine users, consent dependency register.
Fabrication of barrier elements. First article tests gate the rest of the order. F04M5–M9Procurement and fabrication
Supplier qualification, first article tests, module fabrication at 120 m elements, quality records.
Pipes prepared for towing. Installation is staged so early results inform later placement. F05M9–M15Marine installation
Shore base, towing, anchoring, segment commissioning, staged so early results inform later placement.
Multi-sensor monitoring. Handover requires a measured baseline, not a declared one. F06M15–M17Commissioning and handover
Integrated testing, operator training, performance baseline, as-built records and open items.
Decision gates
| Gate | Release evidence | Principal dependency |
|---|---|---|
| Concept selection | Survey plan, alternatives, route constraints and initial feasibility | Access to historical engineering and baseline data |
| Design freeze | Checked calculations, drawings, environmental and navigation integration | Adequate observations and resolution of critical assumptions |
| Procurement release | Approved specifications, quantities, quality plan and commercial scope | Funding authority and defined treatment of long lead risk |
| Installation release | Required approvals, accepted components and qualified marine procedures | Permits, vessels, shore base and a suitable weather window |
| Operational acceptance | Commissioning evidence, trained team and agreed performance results | Complete records and closure of critical defects |
Each gate releases the next commitment only when its evidence exists. A gate is not a date; it is a condition.
Two reconciliation notes
Approvals must not trail the decisions that depend on them
The source schedule places environmental processing in months 3 to 6. If approvals arrive after procurement or installation decisions, the programme absorbs redesign or stands down. Scoping and navigation engagement should begin during concept development.
Different commitments, different durations
A technical effort of roughly three months and a commercial aspiration of five months address narrower work than physical delivery. They do not replace the approximately 17 month installation programme and should be reported separately.
The useful output of this phase is not a date. It is a package that supports a clear proceed, revise or stop decision.