The crack in the Dining Pavilion, of course 
In the third book, Percy goes on a quest to save Annabeth from Atlas. Artemis gets there first and is coerced into holding the sky, so some hunters of Artemis also go to rescue their patron. Bianca di Angelo, Nico's sister and a huntress, is chosen as a member of the quest and Nico asks Percy to protect her. But she dies, and when Percy returns to camp without her, Nico blames him.
Also during the quest, Atlas sets a band of undead skeleton warriors birthed from the teeth of a dragon on poor old Percy. They hunt him cross country until they break into camp and interrupt Percy telling Nico that Bianca is dead. Nico is enraged because he thinks Percy is trying to kill him, so being the son of Hades he (awesomely) opens up a one-way track to hell.
Well Percy says the fissure was 20 feet long, which is equivalent to 6.096m. The width spans all four warriors who arrange themselves in phalanx formation whenever they attack, so I'm going to say about 4 meters for the other width.
Percy comes across a sign in Camp Jupiter that indicates Hades to be 2310 miles underground. That's 3717585m.
The volume of an elliptical cylinder is pi*r1*r2*h.
v=pi*(6.096/2)*2*3717585
v=71196023.572m^3
Dunno much about compressive strength, but Mike says for rock it's about 200 MPa.
1 Pa=1 N/m^2
71196023.572*200*1000000=14239204714400000 N*m
1 J=1 N*m
14239204714400000J
or about 3.4 megatons.
Eh.
In the third book, Percy goes on a quest to save Annabeth from Atlas. Artemis gets there first and is coerced into holding the sky, so some hunters of Artemis also go to rescue their patron. Bianca di Angelo, Nico's sister and a huntress, is chosen as a member of the quest and Nico asks Percy to protect her. But she dies, and when Percy returns to camp without her, Nico blames him.
Also during the quest, Atlas sets a band of undead skeleton warriors birthed from the teeth of a dragon on poor old Percy. They hunt him cross country until they break into camp and interrupt Percy telling Nico that Bianca is dead. Nico is enraged because he thinks Percy is trying to kill him, so being the son of Hades he (awesomely) opens up a one-way track to hell.
Well Percy says the fissure was 20 feet long, which is equivalent to 6.096m. The width spans all four warriors who arrange themselves in phalanx formation whenever they attack, so I'm going to say about 4 meters for the other width.
Percy comes across a sign in Camp Jupiter that indicates Hades to be 2310 miles underground. That's 3717585m.
The volume of an elliptical cylinder is pi*r1*r2*h.
v=pi*(6.096/2)*2*3717585
v=71196023.572m^3
Dunno much about compressive strength, but Mike says for rock it's about 200 MPa.
1 Pa=1 N/m^2
71196023.572*200*1000000=14239204714400000 N*m
1 J=1 N*m
14239204714400000J
or about 3.4 megatons.
Eh.
