 
 <prompt> ```Who specifically get advantage with their underground bunkers and tunnels? Given the previous question, write a context wey contain the answer. E fit be 1 - 20 sentences. Context:``` <response>: From early 1944 reach the days wey dey lead to di invasion, Kuribayashi transform di island into one big network of bunkers, hidden guns, and 11 mi (18 km) of underground tunnels. Di heavy American naval and air bombardment no do anything but make di Japanese go further underground, making their positions impervious to enemy fire. Their pillboxes and bunkers dey all connected so if one dey knocked out, dem fit occupy am again. Di network of bunkers and pillboxes greatly favor the defender. 