From Coastline to Waterway
Secret InvasionThis flow traces how an apparent coastal infestation spreads through rivers, canals, and connected wetlands, forcing the campaign to widen inland.
increasing
Bearing strength in each event
decreasing
A Maryland Pier Attack

A Maryland Pier Attack
A fisherman surrounded
Dennis discovers that the familiar bay has become dangerous when creatures climb onto his pier. His attempt to escape by swimming exposes him to pursuit beneath the surface.
The water is not a refuge
His death shows that the animals can exploit aquatic routes and attack from multiple directions. The incident foreshadows the difficulty of defending settlements built along bays and rivers.
A Gulf Coast Surprise

A Gulf Coast Surprise
The map changes
News of a deadly encounter at Perdido Key reaches the research team vacationing at Cocoa Beach. The location lies on the Gulf, beyond the pattern they had expected from Atlantic currents.
A second origin is considered
Ron and Andy debate whether currents explain the spread and conclude that another point of origin may be involved. Their working map must expand westward, and the campaign can no longer treat the Atlantic shoreline as the whole problem.
The Mississippi River Reports

The Mississippi River Reports
Freshwater danger
Reports of missing people and attacks near New Orleans suggest that the animals have entered the Mississippi River system. Their ability to survive in freshwater removes an assumed barrier to their movement.
An inland corridor
The river could carry danger far beyond the coast, linking wetlands, cities, and tributaries. The team redirects its attention toward tracing the migration upstream before scattered incidents become an inland infestation.
The Delacroix Disappearance

The Delacroix Disappearance
A tour becomes a trap
Paul Fontenot takes a bachelor party into the bayou, where dead alligators first signal that the local food web has changed. A creature then pulls Paul under, and more sliggers climb aboard the airboat.
The route widens
The disappearance demonstrates that the threat occupies marsh channels as well as shorelines. The loss of an experienced guide makes the region’s everyday knowledge and familiar recreational routes feel suddenly unreliable.
An Inland Search Line

An Inland Search Line
Following the river
Military units and federal advisers search the Mississippi corridor in a disciplined line. Nests and adult creatures are found near Baton Rouge, while the teams continue upstream toward St. Francisville.
Progress remains provisional
Every cleared stretch reduces the threat, but the fast reproduction and adaptable biology make any premature declaration dangerous. The search ends only after extensive additional waterways produce no further nests.
Early in the outbreak, at night in Port Republic
After the first coastal clearances
After the Perdido Key attack
During the Gulf Coast phase of the crisis
Late in the campaign, as troops move north from Baton Rouge