The victim remains in a serious but stable condition after the attack at St Matthias Academy.
The explorer was conferred with an honorary Doctor of Laws degree from the University of Bristol.
The orb, covered in detailed NASA imagery of the Earth's surface, was created by Luke Jerram.
The event was the culmination of two weeks of events celebrating LGBT diversity in the city.
John Volanthen said the team of divers located the boys due to the smell in the flooded cave in Thailand.
Gloucestershire host Essex Eagles in the T20 Blast - listen to live BBC local radio commentary
Glamorgan host Somerset in the T20 Blast - listen to live BBC local radio commentary
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The James Hanson Show
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