and propagated fore and aft along the path of least resistance

然后沿着阻力最小的方向从船头传到船尾
until it hits this access hatch.

一直传到这个出入舱口
And that's where it gets really bad.

糟糕就糟糕在这儿
The blast wave continues

冲击波继续前进
into the engine room,bursting the fuel tanks.

进入动力室使燃料箱爆炸
This utility shaft here acts like a chimney,

这个通风管道起到了烟囱的作用
draws the thermal components into the engine room,

它把高热物质引进轮机舱
which ignites the fuel vapor,causing a secondary explosion

后者点燃了燃油蒸汽引发二次爆炸
of far greater magnitude.

更为强烈的爆炸
Essentially,

从根本来说
the initial device turns the whole ferry into a bomb

就是用第一次爆炸把整艘船变成一个大炸弹
and detonates it.

然后再引爆它