Its a Chinese Ming class which is an adaptation of the Russian romeo. Here is a link to the Stats page with a complete list of boats and Specs.http://russian-ships.info/eng/submarine ... ct_633.htm If you look at the bottom of the page you will find the 92 units listed under China.
There are OLD pilots and there are BOLD pilots but there are very few OLD BOLD pilots. MAG
When surfaced, the bridge access hatch can be optionally open or shut, however, when submerged it is required to be shut. (Really a no s***t precaution from a procedure in use in the sub fleet today.)