Calc Bubbles (she is the joy and the laughter) (PJO)

Not really, but the feat does entail bubbles, so yeah :distracted

The Son of Neptune said:
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!

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That's 3717585m.

In The Lightning Thief, Percy, Grover, and Annabeth travel to the Underworld to bargain with Hades. Things go sour and he attacks them, but Poseidon thought ahead and provided the trio with pearls, which expand into protective bubble vehicles, to get them home safely.

For a few moments, I couldn't see anything outside the smooth walls of my sphere. Then my pearl broke through the ocean floor.

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A few moments sounds pretty short. 3-10 seconds d

3 seconds

3717585/3=1239195m/s

or about mach 3645.

5 seconds

3717585/5=743517m/s

or about mach 2187.

10 seconds

3717585/10=371758.5m/s

or about mach 1093.

So mach 1093-3645.