393466
Discovery In 1997 , the Hawai i Mapping Research Group conducted a detailed sonar survey of the seafloor around Guam , discovering what is believed to be the second or third deepest location in the world 's oceans ; its existence was confirmed in 2001 and it was temporarily named HMRG Deep .
 Guam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Guam