Diesel engines need oxygen, so how do submarines use them underwater?

Diesel engines cannot work without oxygen, so how do diesel submarines operate when they're underwater? Their propulsion ...

Nuclear Submarines Can Stay Underwater For Months - Here's How

Nuclear submarines carry out multiple types of missions, but no matter the mission, it's vital that they remain hidden in the ...
The Diplomat

Panel Urges Japan to Use ‘Next-Generation Propulsion Systems’ in New Submarines

JS Raigei, the fourth Taigei-class diesel-electric submarine with the Japan Maritime Self-Defense Force. Credit: The Japan Maritime Self-Defense Force (JMSDF) A Japanese Defense Ministry panel called ...
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$6 Billion ‘Nuclear’ Nimitz-Class Aircraft Carrier Was ‘Sunk’ by $100 Million Diesel AIP Submarine

Key Points and Summary - In a 2005 war game, a $100 million Swedish Gotland-class submarine repeatedly "sank" the $6 billion USS Ronald Reagan aircraft carrier. -Its revolutionary Air-Independent ...
Naval News

Japan Commissions Fifth Taigei-class Submarine

The Japan Maritime Self-Defense Force (JMSDF) has commissioned the fifth of its Taigei-class diesel-electric attack ...