 Shares of Carnival Corp. CCL, 13.28 soared 13.7 in afternoon trading, to bounce off the previous sessions 30-year closing low, and enough to be the SP 500s SPX, 2.89 third-biggest gainer. The two bigger gainers were fellow cruise operators, as shares of Royal Caribbean Group RCL, 15.15 ran up 15.4 and Norwegian Cruise Line Holdings Ltd. 