They found coal. That's all I know. They're starting to suspect it may have come from a Japanese destroyer, but they're not sure.
The Hood sank in waters not nearly 45,000 feet deep (45,000 comes from a tiny crack that continues to run downwards inside the trench bottom; nobody is sure where it stops). We're talking the deepest point on Earth here, not a couple of miles (like 2 or 3). The Trench is over 9 miles down. At the bottom, the water column above exerts a pressure of 108.6 MPa, over one thousand times the standard atmospheric pressure at sea level.
That's 8 tons PER SQUARE INCH, more than enough to cause a sinking battleship to implode, let alone destroy munitions inside.
The speed that the Indianapolis would have gained during her fall probably would be what would set off the munitions inside. Assuming it wasn't smashed to pieces upon hitting the bottom like a wooden dollhouse falling off a 50-story building, then it's highly unlikely that anything survived the explosions of bombs and shells.
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