event     event_type                sta       cast      date           time      lat       lon       depth_w     activity_and_comments                depth       press    bot      
9         CTD_cast                  4         1         20070810       2311      23.750    -159.350  4739        nd                                   5           5.56     10       
9         CTD_cast                  4         1         20070810       2311      23.750    -159.350  4739        nd                                   5           5.53     9        
9         CTD_cast                  4         1         20070810       2311      23.750    -159.350  4739        nd                                   25          24.80    8        
9         CTD_cast                  4         1         20070810       2311      23.750    -159.350  4739        nd                                   25          25.41    7        
9         CTD_cast                  4         1         20070810       2311      23.750    -159.350  4739        nd                                   45          45.72    6        
9         CTD_cast                  4         1         20070810       2311      23.750    -159.350  4739        nd                                   45          45.30    5        
9         CTD_cast                  4         1         20070810       2311      23.750    -159.350  4739        nd                                   75          75.46    4        
9         CTD_cast                  4         1         20070810       2311      23.750    -159.350  4739        nd                                   75          76.02    3        
9         CTD_cast                  4         1         20070810       2311      23.750    -159.350  4739        nd                                   75          75.89    2        
9         CTD_cast                  4         1         20070810       2311      23.750    -159.350  4739        nd                                   75          75.50    1