OBigO

Hi! I posted this in the lighting section too but I don't have much time so have linked it here too! Sorry if that is bad etiquette but I am off tomorrow morning! Thanks for any help or either problem!

http://wetpixel.com/...=49771&p=327641

Hi Guys! I am off to the Similan islands tomorrow and want to use my YS-01 for the first time but I am having some problems. I am not sure if it is just because I haven't tested it underwater but when I take a picture with the flash I am getting two white horizontal lines one on top of the other and dark areas in between them.  I have tried with the diffuser and without but get the same result...I have also tried all the settings (TTL and with/without pre flashes) and different powers. I am new to all this but I was expecting a much brighter flash as well.  On the camera I should be setting it to fill-flash right and using TTL on the strobe? I will try and upload a photo up now to show what is happening but maybe this isn't even a problem anyway as the light might spread out better underwater? Thanks in advance for any help!