On a local scale, ports support an ecosystem of activities consisting of port users directly dependent on its capabilities. Such port clusters usually include: (i) logistics and warehousing; (ii) manufacturing; (iii) heavy industries (e.g. petrochemicals); (iv) energy production; and (v) transformation activities. This cluster is highly interdependent with port activities, implying that its resilience is based on the capability of the port to handle its cluster’s inputs (coming as imports) and outputs (coming as exports). Under normal circumstances this co-dependency is a factor of efficiency, but can be a vulnerability in the event of a disruption.