179377
It only measured 2 – 3 feet by 5 feet ( 61 – 91 cm by 1.5 m ) , and was intended as the drain for a larger tunnel for passenger use .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None