Ok. Sorry for bad english.
My idea was to add pre-triton craft, because no flying subs exist, and all projects of them are mostly fiction. So they must be invented in future, maybe after first analysis of alien USO's. But we need something, what could deliver our units on the battlefield. What we can use for it now - bathyscaphe or small submarine, carried by flying boat or by helicopter.
I created bathyscaphe mapblock, etc, but suddenly thinked about terror missions. Fly to them on helicopter and then deploy a bathyscaphe on port site looks... well, stupid.
And yes, second option of Solarius will work.
Or, instead of this, it is possible to create just deployment site, like square on the ground, where units will just "jump down from a board of boat". Will work fine, but not so pretty looking as bathyscaphe. And what is important, will work without OXCE, what means will work on android.