The only snorkel that is any good in diving is the finnish 'scuba board':
Snorkkeli.net - Sukellusta Yli Maailman Rajojen!
Snorkkeli.net - Sukellusta Yli Maailman Rajojen!
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(did you ever get my pm btw?)
Success! Used two zip ties to create an attachment point on the snorkel, and a rubber band to hook it to my BC. Instructors were happy, I was happy, all was well.