Submarine Kayak (Really)

Advice
#1

You gotta see this:



http://www.brunel.ac.uk/~acsrrrm/kayak/sleep.html

#2

suggestion
check this out. Maybe you’ll get into it.



http://www.angstkayak.com/index2.html

#3

that’s easy
just take the lids off your hatches, and open your pee zip