"tightly interconnected" is a correct and usable phrase in written English.
You can use it to describe how two or more things are closely related in some way. For example, "The global economy is tightly interconnected, with each country relying on the others for resources and exports."
This is in line with the concept that the immune and metabolic systems are tightly interconnected and that this interconnection is pivotal in the development of co-morbidities of obesity.
Keeping secrets safe may no longer possible in tightly interconnected world – for individuals, corporations or governments.
Even at the beginning of the American Civil War, the old and new worlds had become tightly interconnected.
Organic, sorbed and mineral P are tightly interconnected with dissolved P and strive for equilibrium with it.
The damaged world she lives in remains an ecosystem in which animals and humans, field and stream, purity and pollution, love and hate are tightly interconnected.
For one thing, we are too complex: our behavior depends on an enormous number of tightly interconnected variables that are extraordinarily difficult to distinguish and study separately.
Over time he may create a set of huge, tightly interconnected plants that exhibit many of the same characteristics as a process organization: tight central control, inflexibility, and constraints on further incremental expansion.
All of these relationships make financial institutions more tightly interconnected.
Since Facebook's users are so tightly interconnected, it can be a vector for security threats.
Two tightly interconnected issues could stop the bill in its tracks in the Senate.
This allow us to unveil relations between touristic sites and find which ones are more tightly interconnected.
