Hi try Colona
I took this from their facebook
Colona Sharm has started a new system where we can offer full Diving Insurance that begins immediately. No waiting for confirmation emails or 24 hrs for payment clearance. This means the diver can decide on the day of check in or even on the boat to have insurance.
No messing about with credit cards we pay for you and add it to the bill.
It only costs 5euros/day so it’s ideal for the diver who wants to dive only a few days.
It has added bonuses of; Diving upto 50mtrs (ideal for technical divers) and it fully covers rescue boat transport, which is one thing that most other insurances don't cover.
Weekly, Monthly and yearly policies are available too.
Policies are supplied by Divemaster Insurance full info at
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COLONA DIVERS SHARM EL SHEIKH | 360 panorama images | Diving Sharm el Sheikh