South America · Isolated Landmass
Chiloé Island
Chile
Chiloé Island is strongest on Population Capacity 9/10 — The current island/archipelago population and settlement network are orders of magnitude above twenty people, with extensive housing and public/commercial infrastructure. It remains below the absolute maximum because the canonical geography is dispersed and some smaller communities have more constrained utility throughput.. Its clearest scored constraint is Defensibility 1/10 — Chiloé is a large inhabited island system with many towns, roads, ferry/port facilities and a long coastline. Twenty survivors cannot defend the canonical geography as one perimeter, and no preferred town or farm is substituted..
Overall
4 out of 10Defensibility
1 out of 10Isolation
3 out of 10Sustainability
8 out of 10Ranking context
How this base ranks
Global
#68 of 91 · Top 74.73%
Region · South America
#7 of 8 · Top 87.5%
Base Type · Isolated Landmass
#12 of 19 · Top 63.16%
Field assessment
At a glance
Bottom Line
For the fixed 20-person Base boundary, the most important endurance constraint is Maintenance Resilience 5/10 — Traditional agriculture/fisheries, ordinary housing and dispersed communities retain substantial low-tech value, while current water and electricity systems provide mature infrastructure. National-grid dependence, pumps/treatment and marine/road logistics still require specialist maintenance and external parts/fuel, so resilience is mixed rather than robustly autonomous..
Biggest Trade-off
The central trade-off is the catalogue's strongest evidenced dimension, Population Capacity at 9/10, against its weakest evidenced dimension, Defensibility at 1/10.
Most Likely Failure
The clearest evidenced failure pressure is Maintenance Resilience: Traditional agriculture/fisheries, ordinary housing and dispersed communities retain substantial low-tech value, while current water and electricity systems provide mature infrastructure. National-grid dependence, pumps/treatment and marine/road logistics still require specialist maintenance and external parts/fuel, so resilience is mixed rather than robustly autonomous.
Score rationale
Why it scores this way
Defensibility · 1/10
Chiloé is a large inhabited island system with many towns, roads, ferry/port facilities and a long coastline. Twenty survivors cannot defend the canonical geography as one perimeter, and no preferred town or farm is substituted.
Advantages
- Positive credit is limited to what supports the Defensibility score of 1/10; the component rationale is: Chiloé is a large inhabited island system with many towns, roads, ferry/port facilities and a long coastline. Twenty survivors cannot defend the canonical geography as one perimeter, and no preferred town or farm is substituted.
Limitations
- Do not infer additional Defensibility capability outside the fixed Base boundary or beyond the recorded evidence.
Isolation · 3/10
The Chacao Channel and wider maritime geography provide real separation, but roughly 177,000 residents already live across Chiloé and normal ferry, road-linked and air connections keep regional movement straightforward. The island gains some time, not deep remoteness.
Advantages
- Positive credit is limited to what supports the Isolation score of 3/10; the component rationale is: The Chacao Channel and wider maritime geography provide real separation, but roughly 177,000 residents already live across Chiloé and normal ferry, road-linked and air connections keep regional movement straightforward. The island gains some time, not deep remoteness.
Limitations
- Do not infer additional Isolation capability outside the fixed Base boundary or beyond the recorded evidence.
Sustainability · 8/10
A mature population approaching 177,000 demonstrates extensive housing, sanitation, healthcare, food preparation, roads, water services and year-round community life. Strong agriculture and fisheries reinforce the habitat, while wet/cool climate and dependence on maintained utility networks keep it below the strongest class.
Advantages
- Positive credit is limited to what supports the Sustainability score of 8/10; the component rationale is: A mature population approaching 177,000 demonstrates extensive housing, sanitation, healthcare, food preparation, roads, water services and year-round community life. Strong agriculture and fisheries reinforce the habitat, while wet/cool climate and dependence on maintained utility networks keep it below the strongest class.
Limitations
- Do not infer additional Sustainability capability outside the fixed Base boundary or beyond the recorded evidence.
Survival horizons
How survival changes over time
First 7 days: current defence/contact profile
First 7 Days
This horizon does not invent future upgrades or resupply. It carries the current evaluated conditions forward and keeps unknown future capability uncredited.
Positive factors
- The stronger current condition in this horizon is Exposure Control 4/10 — Sea channels constrain some outside arrivals to ferry/boat routes, but the island system has many settlements, internal roads and coastal landing opportunities plus a substantial resident population. Twenty survivors gain regional warning without being able to monitor movement across the whole geography..
Risks
- The weaker current condition in this horizon is Defensibility 1/10 — Chiloé is a large inhabited island system with many towns, roads, ferry/port facilities and a long coastline. Twenty survivors cannot defend the canonical geography as one perimeter, and no preferred town or farm is substituted.; no better future state is assumed.
First 100 days: current habitat/capacity profile
First 100 Days
This horizon does not invent future upgrades or resupply. It carries the current evaluated conditions forward and keeps unknown future capability uncredited.
Positive factors
- The stronger current condition in this horizon is Population Capacity 9/10 — The current island/archipelago population and settlement network are orders of magnitude above twenty people, with extensive housing and public/commercial infrastructure. It remains below the absolute maximum because the canonical geography is dispersed and some smaller communities have more constrained utility throughput..
Risks
- The weaker current condition in this horizon is Sustainability 8/10 — A mature population approaching 177,000 demonstrates extensive housing, sanitation, healthcare, food preparation, roads, water services and year-round community life. Strong agriculture and fisheries reinforce the habitat, while wet/cool climate and dependence on maintained utility networks keep it below the strongest class.; no better future state is assumed.
Long term: current resource/maintenance profile
Long Term
This horizon does not invent future upgrades or resupply. It carries the current evaluated conditions forward and keeps unknown future capability uncredited.
Positive factors
- The stronger current condition in this horizon is Resource Security 6/10 — Chiloé combines current potable-water systems, substantial agriculture, artisanal fisheries/aquaculture and large existing community/commercial stocks, giving broad local resource depth. Electricity is nationally interconnected and many fuels, manufactured goods and food categories remain externally supplied, so the island system is resource-strong but not autonomous..
Risks
- The weaker current condition in this horizon is Maintenance Resilience 5/10 — Traditional agriculture/fisheries, ordinary housing and dispersed communities retain substantial low-tech value, while current water and electricity systems provide mature infrastructure. National-grid dependence, pumps/treatment and marine/road logistics still require specialist maintenance and external parts/fuel, so resilience is mixed rather than robustly autonomous.; no better future state is assumed.
Tactical assessment
Practical Reality
Reality Check
Scores apply only to the defined Base and exactly 20 capable adults. Unknown, excluded or external assets are not credited as hidden capability.
Best Use
Within the evaluated boundary, treat Population Capacity as the primary operational strength; do not promote that score into capabilities the evidence does not establish.
Key Risk
Maintenance Resilience is the key evidenced long-duration risk: Traditional agriculture/fisheries, ordinary housing and dispersed communities retain substantial low-tech value, while current water and electricity systems provide mature infrastructure. National-grid dependence, pumps/treatment and marine/road logistics still require specialist maintenance and external parts/fuel, so resilience is mixed rather than robustly autonomous.
Strengths
- One of the strongest scored dimensions is Population Capacity 9/10 — The current island/archipelago population and settlement network are orders of magnitude above twenty people, with extensive housing and public/commercial infrastructure. It remains below the absolute maximum because the canonical geography is dispersed and some smaller communities have more constrained utility throughput..
- One of the strongest scored dimensions is Sustainability 8/10 — A mature population approaching 177,000 demonstrates extensive housing, sanitation, healthcare, food preparation, roads, water services and year-round community life. Strong agriculture and fisheries reinforce the habitat, while wet/cool climate and dependence on maintained utility networks keep it below the strongest class..
- One of the strongest scored dimensions is Resource Security 6/10 — Chiloé combines current potable-water systems, substantial agriculture, artisanal fisheries/aquaculture and large existing community/commercial stocks, giving broad local resource depth. Electricity is nationally interconnected and many fuels, manufactured goods and food categories remain externally supplied, so the island system is resource-strong but not autonomous..
Weaknesses
- One of the weakest scored dimensions is Defensibility 1/10 — Chiloé is a large inhabited island system with many towns, roads, ferry/port facilities and a long coastline. Twenty survivors cannot defend the canonical geography as one perimeter, and no preferred town or farm is substituted..
- One of the weakest scored dimensions is Isolation 3/10 — The Chacao Channel and wider maritime geography provide real separation, but roughly 177,000 residents already live across Chiloé and normal ferry, road-linked and air connections keep regional movement straightforward. The island gains some time, not deep remoteness..
- One of the weakest scored dimensions is Exposure Control 4/10 — Sea channels constrain some outside arrivals to ferry/boat routes, but the island system has many settlements, internal roads and coastal landing opportunities plus a substantial resident population. Twenty survivors gain regional warning without being able to monitor movement across the whole geography..
Assumptions / constraints
- Only assets inside the recorded Core Base and immediate operating boundary are credited; excluded surroundings and unproven future access remain outside the score.
Decision context
Rivals / Alternatives
Similar rival
Tasmania
Australia · Isolated Landmass
Tasmania keeps the same isolated landmass strategy, with only 0.3 points between the overall scores and closely matched sustainability pressure.
Overall 4.3/10
Strongest alternative
Heligoland
Germany · Isolated Landmass
Heligoland scores 6.3 overall versus 4.0, adding a stronger isolation profile while staying relevant as another isolated landmass.
Overall 6.3/10
Wildcard rival
Fort Jefferson
United States · Fortified Structure
Fort Jefferson changes the strategy: it is a fortified structure with a defensibility edge, while Chiloé Island holds more of the sustainability advantage.
Overall 6.7/10