These are clips from a second dive at the USCGC "McCulloch" wreck site. In these clips you can see the following features:
0:00 - Engine room "Skylight".
0:29 - Boilers (from the port side)
1:25 - Boilers (from the starboard side)
2:35 - Engine
1:54 - Starboard gun turret area w/ stacks of 6-Pounder (57mm) shells