Which "amplified the effects of the time dilation from the black holes gravity".
From the point of view of those on board the ship, no time passed, but for those outside 300 years went by.
But yes, the gravity would pancake everyone on board and you would need some wicked engine power to get away from the event horizon.
In the TV show they were 'towed' out with what I can only describe as the worlds greatest tow rope!
Ironically, I just finished watching all five seasons of it. So pretty sharp on it's content at the moment.