Question Dealing with Dry Suit Floods on Liveaboard

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At those temps I wouldn’t risk traveling with my drysuit, use the one they provide and travel easy.
 
I assume it was not a small amount of $$$ for the trip. If it were me, I would purchase a 5mm wetsuit as a backup or just bring the wetsuit. Compared to the cost of the trip, it is a bit of insurance to ensure you enjoy every dive.

I have a DUI 30/30 that I bring along with light undergarments for trips that have multi-day diving with water temperatures in this range . I also bring a 3mm or 5mm wetsuit (Henderson Thermaxx) as backup. The 30/30 has ankle seals so I use the same booties and hood I would use with the wetsuit.
 
I just got back from a week on the Turks and Caicos Aggressor, water temps a consistent 85. My roommate used his dry suit all week without incident. He has replaceable seals but never had a problem.
 
Just bring the drysuit with replaceables. A damp drysuit no issue, if you have a full flood I assume you don't want to dive more that day anyway, leaving plenty of time to dry the drysuit and undergarments. Bring aquasure and seals! 70F water is to cold for 1 wetsuitdive a day, 4 would have my crying! 😅
 
Loss of core temp is cumulative. I took a 5 mil to Bonaire and was glad I did. As many dives as we were doing, I'd not have been able to in a 3 mil.
But that's me. No one can say what's right for you except yourself. No one.
If it was me, I'd take a drysuit with two sets of light undergarments. Not just for changing due to ripening of them, but because at the end of the week after 3-4 days of 4 dives a day. And I would think you could alternate between sets to reduce the funk and maybe rinse a set out and let it hang to dry in the sun while using the other set.
Having the option to double up would ensure I enjoyed my dives without the risk of hypothermia. Yes, you can get hypothermic in 80-degree water. Start with a low enough core temp, not enough sleep to generate internal heat, etc.
My Gf took her drysuit to Turks and Caicos in August. First day on the boat some people gave her funny looks. By the end of the week they didn't as they sat between dives shivering with blue lips and she was there just relaxing, warm, and dry.
 
I don't have much body fat and always take my 5mil and hooded vest for week long trip. I'm rarely cold and have never been too warm either.
 
https://www.shearwater.com/products/teric/

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