Before everyone gets too creative - this is John Rudolph - top UK deep tech diver - uses a homebuild twin scrubber rebreather - mad as a badger
The answer is of course they're DIR - but the 14 backuplights have to be attached to the helmet with caveline.
When Jarrod and Casey finally announce in 12 months time that the Wakulla dives have finally called for a CCR and that the Rudolph Mk15.5 Twin Scrubber is a visionary piece of rebreather design and will become the WKPP weapon of choice - then I will be eating humble pie of course
But in the meantime - go and stand on the naughty step - bad Rudolph!