[texas booster]

DNA breaks down in heat.

Somre parts are strong and withstand high temperatures, some part of DNA are not as strong.

Ask anything beyond that, better get Physicist or grey_whiskers to help.

Now, how they get into a 70 square meter clump of cooling steel to recover said DNA, I have no idea.

That is what? 215 feet by 215 feet? What wall is going to withstand that much mass and heat?

Wonder how thick the resulting slag is in that room?

[spunkets]

It would be completely obliterated at ~800^oF. All they would have to work with is any that didn't get up that high, as in the long bones. At less than that, it would depend on time at temp, and whether the fragments were any good.