How could a simple submarine be built using 100 BC technology?

I have some ideas, but I'd like my fictional Roman (100BC) General Mikey (ha) to build a submarine(s). This should be able to navigate in lakes and calm shores of the Mediterranean, succeed in bringing down simple boats loaded with soldiers, and finally, travel longer than "just as much air is inside.*" I do not want it to be detected.

Unsure of the number of crew, but just needs to succeed in the above mission. How can I design this advanced machinery, knowing what we know now, but with 100 BC technology?

*) It can surface from time-to-time, but I'd prefer to push the boundary beyond "just as much air already inside".

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How could a simple submarine be built using 100 BC technology?

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