The reason TFTD ( Terror from the Deep ) was so much more fun than Enemy Unknow was the
addition of underwater missions. To be honest I dont care that its not possible in what ever
time period this game takes its events from. Its not like I will be sitting there going " ohh man
how can they go to the ocean floor and not imploded" I dont care about that bullshit.
Dont limit your self to what the time period made available because if something is
fun its not going to bother people.
Plus it makes the repetitivesness of missions on the ground break from the norm.
Its so cool that you can go underwater and see different suits weapons and different
land scapes. Its gives the game a fresh breath of air.