Mid-sized sub

I saw there is a very big sub coming called the “trident” no matter what balancing is made to it.. it will be a little more tricky to operate as a solo.. so i think a half sized sub would be awesome.. you would be able to build in it, dock one tadpole, navigate through tighter areas, and go a little faster.. maybe make it not modular but upgradeable so if there was a little upgrade station for it you could upgrade it to have a little dock for tadpole which would make it SLIGHTLY bigger and maybe some other upgrades.. but dont make it the MAIN selling point like the sea truck.. SIMILAR TO THE IMAGE