Do I need a second strobe?

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I WAS wondering which strobe to get to add to my MXIIE and the YS60 strobe that came with it. Now I'm wondering(after looking at photography prices!!) if I even need one. When would a second strobe be of benefit in my UW photography?? Do I need one?

Thanks
Mike

 

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If I would have taken the time to read all the replies to the first time I asked this question I wouldn't have to be writing this!
Thanks everyone for answering my question as to which strobe I need. The replies were mixed-not surprising-and well thought out.
Being an amateur photographer I always notice what the pros use. I generally see Nikonos cameras with identical dual strobes. I do like the idea of havign someone hold a slave strobe at a distance and angle to get a little more depth in the background, but my wife is always reluctant to play servant to my photography desires.
I think another YS60 strobe angled a little different and at a different height than its partner would give me a different enough lighting perspective.

Thanks for the replies
Mike