28075
To withstand the enormous pressure of 1.25 metric tons per cm ( 110 MPa ) at the bottom of Challenger Deep , the sphere 's walls were thick ( it was overdesigned to withstand considerably more than the rated pressure ) .
 Challenger Deep
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Challenger Deep