Guys, I am not going to offer any speculation on this incident, or pass on any unconfirmed info, but will attempt to add some facts for the benefit of those who haven't dived the USS New York....
From:
http://www.abs-cbnnews.com/nation/regions/07/18/11/missing-foreign-diver-found-dead-subic
MANILA, Philippines (UPDATED) – Rescuers finally retrieved the body of an American dive instructor who went missing along with a Chinese diver in waters off Subic in Zambales province.
Dive instructor Steve Brittian’s body was retrieved around 7 a.m. Tuesday.
Brittian and Chinese diver Shun Chuen Tin went missing last Sunday while conducting a diving course at the shipwreck of the USS New York.
On Monday night, the body of Tin was retrieved around 8 p.m. by rescuers from the 80-foot deep waters. However, the operations were halted at night in consideration of the rescuers’ safety.
The victims were trapped at the back part of the shipwreck’s canon near the engine room.
The rescue team said Tin entered the wrong part of the ship and got trapped, causing Brittian to come to his rescue. The American dive instructor, however, was trapped as well.
Another diver accompanying the two, Chinese Fung Long Chow, survived the incident.
The three divers left 3:30 p.m. last Sunday for a technical wreck diving course. Fellow divers declared them missing around 5 p.m.
They said the very poor visibility in the area aggravated the situation of the trapped divers.
Fellow divers added that Brittian, who is an expert of Subic’s ship wreck sites, is a big loss to the diving industry.
Johan de Sadeleir, owner of the dive shop where the 2 rented their gears, said it was supposed to be a fun dive.
– Report from Abner Mercado and Dominic Almelor, ABS-CBN News
This is a confusing report, because the primary access to the engine rooms isn't 'near' the rear gun turret...
There are two main guns (fore and aft) remaining on the USS New York. The nearest gun to the engine room is the aft (rear) gun. The gun itself is about 20m further down the vessel from the small engine room access point that most of the penetrations are conducted through. However, that doesn't mean that these divers were using that penetration point... there
are other penetration points further down the length of the wreck.
The wreck is laid on its port side and is quite structurally intact, other than the mid-ships/bridge section which was blasted open. The top hull is very thickly armored and contains many open access hatches. Most of the interior walls of this deck were wooden, which have now long rotted away and left the entire deck open-plan. It's about 2-3m wide and 10m high. Very dark, but not a lot of silt inside this deck, unless you are at the very bottom. Many divers, including recreational divers, are taken through this deck section as it is quite unrestricted, low risk of silt and there are multiple exit points above and beside divers throughout its length (see below). There are several exit points at the top of the deck (direct ascent to surface), many hatches and holes along the sides... and the gun deck opens out into the broken area, allowing relatively easy exit if you swim forwards.
above: Two divers swimming aft, through the gun deck. Rear 8" turret is situated on the right side of the structure. Hatches on the left side go deeper into the wreck. Light from overhead exit points (smaller gun ports) can be seen illuminating the photo.
above: Example of exit hatches leading out from the gun deck. This exit is at the bottom of the shot line. It is just above the rear comms mast.
The primary entrance/s to the engine room/s are located just in front of the rear comms mast. There is a 3m wide access point just above the sea-floor, which opens into a relatively large space, consisting of 2 levels - the rear bridge superstructure and the gun deck. At the back of this space are two access ladder shaft into the engines. From this open area, divers can also turn right, all the way to the rear of the ship along the gun deck, or left through a short section of the gun deck before it opens out into the open area.
above: Diver exits the gun deck through the broken section in mid-ships. A very straightforward exit route.
Both of the access shafts to the engine are very restrictive (ladder shafts), silted and there is no penetrating ambient light. Permanent guidelines are in place for the first 10m of penetration into both shafts. A diver in doubles will only 'just' fit through the shafts and cannot turn-around without fully clearing the shaft in either direction.
above: Access ladder shaft to the engine rooms. This is where most technical penetrations normally commence. (See the video link in my earlier post for footage of a penetration through this passage).
I hope that description makes sense.
So, from the news report, it's unclear where in the wreck the two divers were. They had either entered the engine rooms via one of the ladder access shafts, or were somehow caught in the general gun deck area (nearer the rear 8" gun turret), which is about 20m further along the wreck.