Gear is a synonym of Great. Great is a synonym of Extreme. Extreme is a synonym of Thick. Thick is a synonym of Midst. 
Canvas is a type of Cloth. Canvas is a type of Cover. Bury entails/necessarily involves Cover. 
Gear <--Synonym--> Great <--Synonym--> Extreme <--Synonym--> Thick <--Synonym--> Midst 
Cloth <--IsA-- Canvas --IsA--> Cover <--Entails-- Bury 