The instant he saw the submarine before him, Kahn was genuinely stunned. Were Sokka and Tezin really that capable? Had they designed a submarine with just the two of them?
Could Sokka be better suited to a career in research?
But only after entering the submarine did he realize it was not as simple as he had imagined-no, rather, not as difficult as he had imagined.
"Using waterbending to submerge a vessel and sail underwater-I have to say, it's a stroke of genius!"
Tezin excitedly introduced their achievement to everyone and praised Sokka's idea.
Sokka was feeling rather carried away, but he still said modestly:
"No, no, I only came up with an idea. You were the one who helped me bring it to life."
"Don't be so modest, young man."
"However, there's still one problem I haven't been able to solve: the submarine has a limited supply of oxygen, so it can't travel underwater for long. It has to surface at regular intervals to replenish its oxygen."
"If we can solve the oxygen problem, it will undoubtedly change the landscape of naval warfare!"
Tezin could not help losing himself in the future he envisioned, while Kahn, standing nearby, had more or less grasped how the submarine worked.
Although its exterior looked much like the submarines from his previous life, at present it was only a steel shell with the right appearance. It did not even have a propulsion system installed and could only be moved by waterbenders using their bending-in other words, it was powered by people.
Of course, this was only a hastily made creation meant to counter the Fire Nation. Given some time, Tezin might truly be able to build a proper submarine, and Sokka, who had come up with the idea of a submarine, was indeed