<s>
X-COM	B-Application
:	I-Application
Terror	I-Application
from	I-Application
the	I-Application
Deep	I-Application
is	O
a	O
strategy	B-Application
video	I-Application
game	I-Application
developed	O
and	O
published	O
by	O
MicroProse	O
for	O
the	O
PC	O
in	O
1995	O
and	O
for	O
the	O
PlayStation	B-Device
in	O
1996	O
.	O
</s>
<s>
It	O
is	O
a	O
sequel	O
to	O
X-COM	B-Application
:	I-Application
UFO	I-Application
Defense	I-Application
and	O
the	O
second	O
game	O
of	O
the	O
X-COM	O
series	O
,	O
this	O
time	O
taking	O
the	O
war	O
against	O
a	O
renewed	O
alien	O
invasion	O
into	O
the	O
Earth	O
's	O
oceans	O
.	O
</s>
<s>
X-COM	B-Application
:	I-Application
Terror	I-Application
from	I-Application
the	I-Application
Deep	I-Application
takes	O
place	O
mostly	O
underwater	O
,	O
with	O
base-building	O
and	O
combat	O
all	O
being	O
submerged	O
beneath	O
the	O
waves	O
.	O
</s>
<s>
Just	O
like	O
X-COM	B-Application
:	I-Application
UFO	I-Application
Defense	I-Application
,	O
the	O
game	O
consists	O
of	O
two	O
parts	O
.	O
</s>
<s>
The	O
second	O
part	O
,	O
the	O
BattleScape	O
,	O
is	O
used	O
for	O
combat	O
between	O
squads	O
of	O
aliens	O
and	O
humans	O
,	O
and	O
takes	O
the	O
form	O
of	O
a	O
turn-based	B-Application
battle	I-Application
from	O
an	O
isometric	B-Application
view	I-Application
.	O
</s>
<s>
Difficulty	O
levels	O
were	O
markedly	O
increased	O
compared	O
to	O
UFO	B-Application
Defense	I-Application
.	O
</s>
<s>
A	O
new	O
feature	O
added	O
in	O
TFTD	B-Application
was	O
melee	O
weapons	O
,	O
thanks	O
to	O
feedback	O
from	O
the	O
players	O
who	O
suggested	O
the	O
idea	O
.	O
</s>
<s>
Terror	B-Application
from	I-Application
the	I-Application
Deep	I-Application
is	O
set	O
in	O
2040	O
,	O
four	O
decades	O
after	O
the	O
events	O
of	O
UFO	B-Application
Defense	I-Application
.	O
</s>
<s>
Eventually	O
,	O
it	O
is	O
revealed	O
the	O
aquatic	O
aliens	O
,	O
cousins	O
of	O
the	O
Sectoids	O
from	O
UFO	B-Application
Defense	I-Application
,	O
came	O
to	O
Earth	O
on	O
a	O
massive	O
spacecraft	O
,	O
known	O
as	O
T'Leth	O
,	O
that	O
crashed	O
into	O
what	O
is	O
now	O
the	O
Gulf	O
of	O
Mexico	O
65	O
million	O
years	O
ago	O
,	O
causing	O
the	O
extinction	O
of	O
the	O
dinosaurs	O
.	O
</s>
<s>
Destruction	O
of	O
T'Leth	O
by	O
the	O
player	O
results	O
in	O
victory	O
but	O
also	O
accidentally	O
results	O
in	O
another	O
worldwide	O
environmental	O
cataclysm	O
,	O
destroying	O
the	O
ecosystem	O
of	O
Earth	O
and	O
setting	O
the	O
stage	O
for	O
the	O
third	O
game	O
in	O
the	O
series	O
,	O
X-COM	B-Application
:	I-Application
Apocalypse	I-Application
.	O
</s>
<s>
MicroProse	O
wanted	O
the	O
developer	O
Mythos	O
Games	O
to	O
make	O
a	O
sequel	O
to	O
UFO	B-Application
Defense	I-Application
in	O
six	O
months	O
.	O
</s>
<s>
Eventually	O
,	O
MicroProse	O
licensed	O
Mythos	O
 '	O
code	O
and	O
their	O
internal	O
UK	O
studio	O
created	O
Terror	B-Application
from	I-Application
the	I-Application
Deep	I-Application
within	O
a	O
year	O
,	O
while	O
Mythos	O
Games	O
began	O
developing	O
the	O
next	O
sequel	O
,	O
Apocalypse	O
.	O
</s>
<s>
Simultaneously	O
with	O
making	O
the	O
console	O
port	O
of	O
Terror	O
,	O
MicroProse	O
UK	O
also	O
began	O
work	O
on	O
their	O
X-COM	B-Application
:	I-Application
Alliance	I-Application
project	O
.	O
</s>
<s>
X-COM	B-Application
:	I-Application
Terror	I-Application
from	I-Application
the	I-Application
Deep	I-Application
was	O
originally	O
released	O
on	O
1	O
June	O
1995	O
for	O
the	O
PC	O
DOS	B-Device
.	O
</s>
<s>
It	O
was	O
ported	O
to	O
the	O
PlayStation	B-Device
in	O
1996	O
.	O
</s>
<s>
In	O
1998	O
,	O
a	O
Windows	B-Application
95	I-Application
port	O
was	O
released	O
with	O
UFO	B-Application
Defense	I-Application
as	O
part	O
of	O
the	O
X-COM	O
Collector	O
's	O
Edition	O
.	O
</s>
<s>
On	O
4	O
May	O
2007	O
,	O
the	O
game	O
was	O
distributed	O
on	O
Steam	B-Application
by	O
2K	O
Games	O
,	O
who	O
has	O
inherited	O
the	O
franchise	O
(	O
first	O
only	O
for	O
the	O
Windows	B-Application
XP	I-Application
,	O
but	O
a	O
later	O
update	O
which	O
enabled	O
Windows	B-Application
Vista	I-Application
support	O
)	O
.	O
</s>
<s>
The	O
fan-created	O
OpenXCom	O
project	O
,	O
originally	O
an	O
improved	O
,	O
modernized	O
remake	O
of	O
the	O
first	O
game	O
,	O
also	O
added	O
TFTD	B-Application
support	O
which	O
fixed	O
a	O
number	O
of	O
bugs	O
and	O
programming	O
oversights	O
in	O
the	O
original	O
game	O
,	O
including	O
better	O
enemy	O
AI	O
.	O
</s>
<s>
Together	O
with	O
its	O
predecessor	O
,	O
X-COM	B-Application
:	I-Application
UFO	I-Application
Defense	I-Application
,	O
Terror	O
from	O
the	O
Deeps	O
sales	O
had	O
passed	O
1	O
million	O
copies	O
by	O
March	O
1997	O
.	O
</s>
<s>
PC	O
Gamer	O
UK	O
called	O
it	O
to	O
be	O
"	O
not	O
only	O
a	O
great	O
sequel	O
to	O
UFO	B-Application
but	O
a	O
superb	O
game	O
in	O
its	O
own	O
right.	O
"	O
</s>
<s>
On	O
the	O
other	O
hand	O
,	O
GameSpot	O
stated	O
that	O
"	O
apart	O
from	O
new	O
art	O
and	O
a	O
handful	O
of	O
new	O
combat	O
options	O
,	O
this	O
is	O
exactly	O
the	O
same	O
game	O
as	O
UFO	B-Application
Defense	I-Application
,	O
only	O
much	O
more	O
difficult.	O
"	O
</s>
<s>
Next	O
Generation	O
felt	O
the	O
same	O
:	O
"	O
In	O
the	O
end	O
,	O
X-COM	B-Application
2	I-Application
is	O
still	O
a	O
phenomenal	O
game	O
,	O
and	O
has	O
been	O
scored	O
as	O
such	O
,	O
but	O
it	O
seems	O
so	O
much	O
more	O
could	O
have	O
been	O
accomplished	O
to	O
make	O
this	O
game	O
more	O
than	O
just	O
a	O
carbon	O
copy	O
of	O
an	O
old	O
game.	O
"	O
</s>
<s>
According	O
to	O
Jake	O
Solomon	O
,	O
the	O
lead	O
designer	O
of	O
2012	O
's	O
XCOM	B-Application
:	I-Application
Enemy	I-Application
Unknown	I-Application
,	O
MicroProse	O
did	O
few	O
new	O
things	O
with	O
the	O
sequel	O
"	O
except	O
made	O
it	O
brutally	O
harder	O
and	O
made	O
the	O
cruise	O
ships	O
four	O
times	O
longer	O
than	O
any	O
human	O
could	O
realistically	O
make	O
,	O
"	O
yet	O
still	O
the	O
game	O
"	O
was	O
awesome.	O
"	O
</s>
