[DUMBGRUNT]

51 miles per hour! That would be some hot water skiing back there!

[HighSierra5]

A torpedo is faster

[Mount Athos]

it’s normal for subs to be faster than surface ships.
Counter intuitive but they go through water easier even though the ship just rides on top

[KarlInOhio]

Though the K-222 was powered by two nuclear reactors,

Little deuce nuke.

[oldplayer]

Ah! But Toshiba fixed that noisy propeller for them. They sold them (or gave them) our plans and machinery for a super quiet prop like we had on our subs.

Thanks, Toshiba. Hope you don’t choke on the money.

[Mariner]

It cannot outrun sonar and the MK-48 torpedo.

Thus only one made.

[JudgemAll]

Alpha Class subs

[PIF]

K-222
The Soviet's 'Golden Fish' Missile Submarine Still Holds The Record As The World's Fastest
The only Project 661 boat ever made was extremely fast underwater, but was also costly and complex to build and operate.
By Joseph Trevithick February 13, 2019

Alfa Class
This Is The World's Fastest Production Submarine's Crazy Molten Metal Cooled Reactor
The reactor used molten lead-bismuth for coolant, which meant it turned into a brick if it stopped circulating, but gave big power for its size.
By Tyler Rogoway April 19, 2020

[Lockbox]

More here

https://www.thedrive.com/the-war-zone/26475/the-soviets-golden-fish-missile-submarine-still-holds-the-record-as-the-worlds-fastest

[Salvavida]

There is no market for loud submarines. Nice try Boris.