Deep diving with a FFM
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OP
As I said that is only coming up when using a FFM snorkeling. Do you have any links I can read up on it for scuba diving?
Edited I found something on it. https://divelab.com/wp-content/uploads/2020/06/Understanding-CO2-Diving.pdf
Full face masks add enormous complexity which does not exist with a normal mask and regulator.
Commercial divers use them for other reasons such as underwater communications. However, they have enormous resources, have surface diver support, use specialist protocols, use surface gas supply, have extensive training and are often diving in hazardous liquids.
We, as recreational divers, dive in generally good conditions and rarely if ever have active surface support. Unless you’re a famous film star you won’t have underwater comms (and the film stars have endless support divers).
40m/130ft is not deep. Double, triple or quadruple that and the complexity goes through the roof with equipment such as rebreathers and several "bailout" cylinders where it is essential to be able to change regulators quickly and calmly.
Commercial divers to deep depths will be using extraordinarily expensive techniques such as saturation diving and diving bells.
The use of full face masks in recreational diving is strictly reserved for film stars for comms (or those stupid inward facing lights) and people who just want to dive with that complexity. The other 99.999% of divers use a mask and regulator (or rebreather mouthpiece).
Use a "gag strap" to hold your mouthpiece in place. Common with rebreather divers but very rare in open circuit diving.
Many of the comments here support the silliness of full face masks. Those FF snorkelling toys should be banned as a massive life threatening danger.
Commercial divers use them for other reasons such as underwater communications. However, they have enormous resources, have surface diver support, use specialist protocols, use surface gas supply, have extensive training and are often diving in hazardous liquids.
We, as recreational divers, dive in generally good conditions and rarely if ever have active surface support. Unless you’re a famous film star you won’t have underwater comms (and the film stars have endless support divers).
40m/130ft is not deep. Double, triple or quadruple that and the complexity goes through the roof with equipment such as rebreathers and several "bailout" cylinders where it is essential to be able to change regulators quickly and calmly.
Commercial divers to deep depths will be using extraordinarily expensive techniques such as saturation diving and diving bells.
The use of full face masks in recreational diving is strictly reserved for film stars for comms (or those stupid inward facing lights) and people who just want to dive with that complexity. The other 99.999% of divers use a mask and regulator (or rebreather mouthpiece).
Use a "gag strap" to hold your mouthpiece in place. Common with rebreather divers but very rare in open circuit diving.
Many of the comments here support the silliness of full face masks. Those FF snorkelling toys should be banned as a massive life threatening danger.
FYI, a rebreather must not be open to the water if removed from the mouth. They flick a switch on the mouthpiece to seal it — called the Dive Surface Valve (DSV).Use a "gag strap" to hold your mouthpiece in place. Common with rebreather divers but very rare in open circuit diving.
dully noted!
When it’s put back into the mouth the DSV is slowly opened as the diver exhales to blow the water from the mouthpiece and mouth "overboard".
With Open Circuit you just purge or exhale to clear the water.
The gag strap is used to prevent the rebreather mouthpiece from being accidentally knocked out and flooding the rebreather.
OP
Whilst on paper it seems a good idea, the reality is the wife wouldn’t be able to cope with all the additional drills and skills required to use an FFM.
Try to convince her to take a one to one course with a sympathetic female instructor in a closed pool to do the basics of diving: mask clear, mask off and on, regulator removal and replace. May save you a fortune in the long run!
OP
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