Re: Seaplanes & Submarines
If you're going for a Traveller setting, TL5 means anything that could have been made with TL5 materials if we'd known how back in the historical period.
If you're going for an alternate (or isolated) world that has only reached TL5 and entirely by its own efforts, you still have a little leeway to imagine inventions and discoveries that could have been made but wasn't.
Hans
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