>>16751986
Starship and Superheavy combined carry thousands of tons worth of fuel. Just converting that weight into tnt gives you a few kilotons worth of of boom, aka a small nuke. Methalox also carries more energy per weight and volume than tnt. Of course, tnt detonates while methane/oyxgen deflagrates, so it's hard to compare it 1:1. But it will be a very big boom.

For reference, the 2020 Beirut explosion was only caused by 2750 tons of ammonium nitrate.