Cruise stocks were sinking with the market at press time. Carnival Corporation was down more than 6.0 percent for the day, to $30.15, which is more than 30 percent off its 52-week high of $44.21, but nowhere near its 52-week bottom of $23.99. Royal Caribbean Cruises was down 8.5 percent at $23.15 which is nearly 40 percent off its 52-week high of $38.12, but far from its 52-week low of $11.80. Investors are left with the same old question: Is there more downside or is this a buying opportunity?