Yeah. That is one of the reasons I never completed TfTD. Some others were - Aquanauts can't swim upwards - how hard could it be?
The technologies have really sucky names
It's really, really hard
the aliens for the most part were awful
Under the sea is bad enough, but door-to-door searches on the ships?
No! ARRGH!
Plus, your soldiers didn't go
it was more like
'Hello I am aqaunaut number 2 :whistle: You may shoot me now if you like, or you could wait until I can't even see you :whistle: '