Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Ian detects a hidden threat dismissed
S1E21
·
The Sea of Death
To
Acid sea revealed and frogman discovery
S1E21
·
The Sea of Death
Why These Connect
The narrative assertion
"Ian expresses concern about a potential threat on the scanner, then they encounter the acid sea, confirming the threat is real."
About Causal Connections
A directly causes B. The first event sets forces in motion that produce the second. These are the load-bearing connections of plot--remove one and the story structure collapses.