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This calculation is a near-copy of a calculation done by Tacocat on Naruto Forums, I only changed some parts of the calc.

Feat[]

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.

Quotes[]

"No!" Nico shouted louder. "Go away!"

The ground rumbled beneath me. The skeletons froze. I rolled out of the way just as a crack opened at the feet of the warriors. The ground ripped apart like a snapping mouth. Flames erupted from the fissure, and the earth swallowed the skeletons in one loud CRUNCH!

In the place where the skeletons had stood, a twenty-foot-long scar wove across the marble floor of the pavilion.

~ The Titan's Curse

The street sign labeled the road to the main gates as VIA PRAETORIA. The other road, cutting across the middle of camp, was labeled VIA PRINCIPALIS. Under those markers were hand-painted signs like BERKELEY 5 MILES; NEW ROME 1 MILE; OLD ROME 7820 MILES; HADES 2310 MILES (pointing straight down); RENO 208 MILES, and CERTAIN DEATH: YOU ARE HERE!

~ The Son of Neptune

Calc[]

The Underworld happens to be 2310 miles, or 3 717 585 meters, underground.

Now, the return trip didn't necessarily have to happen so fast, but I'm concerned with how quickly the flames traversed that distance. The gap was wide enough to encompass four of these spartoi and twenty feet long. Seems to me that at least one of these guys had to be in free-fall, and the flames got there in time for Percy to say they'd been taken by the fire rather than having fallen into the gap.

Using the average dude height, or 1.77 m, for the free-fall formula. Numbers taken to 2 decimals

h = 0.5*g*t^2

1.77 = 0.5*9.81*t^2

3.54 = 9.81*t^2

0.36 = t^2

t = 0.6

3717585/0.6 = 6 195 975 m/s, or Mach 18 207.93

Sub-Relativistic attack speed for Nico di Angelo, nice, dunno if this scales to Hazel Levesque since she's a child of Hades too.

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