Import is the opposite of Export. Export is a synonym of Remove. Pit is a type of Remove. you are likely to find Pit in/at/on Mine. 
Crew is a synonym of Gang. Gang is related to Dangerous. Dangerous is a synonym of Critical. 
Import <--Antonym--> Export <--Synonym--> Remove <--IsA-- Pit --AtLocation--> Mine 
Crew <--Synonym--> Gang <--RelatedTo--> Dangerous <--Synonym--> Critical 