Those adjustments help, but I would also reduce 'haze density' and 'bluesky density'. How much to reduce them depends on what your settings are for 'haze exp height' and 'bluesky exp height'. Theoretically, if you are using the TG2 defaults of 3000 and 8000, then it's possible to calculate the factors as follows:

e ^ (10888 / 3000) ~= 38

e ^ (10888 / 8000) ~= 3.9

Since your camera is 10888 below sea level, the haze and bluesky at this altitude are multiplied by those factors. *Mathematically speaking* if you divide your haze density and bluesky density by the factors 38 and 3.9, respectively, you would correct this difference and make it look like sea level. So, for example, if your bluesky density is at the TG2 default of 2, then you would change that to 2 / 3.9 = 0.51. The haze density should be divided by 38, but that's a big change and when looking at your render I feel as though doing that would be quite extreme. I guess that you already reduced the haze somewhat.

Matt