the pressure from behind increased. 来自后方的压力增加

145. ...a seemingly unstoppable barrier...
     似乎坚不可摧的屏障
146. but not for much longer.
     但坚持不了多久
147. As temperatures kept rising and the meltwater lake kept growing,
     随着温度不断升高 融水湖不断扩大
148. the pressure from behind increased.
     来自后方的压力增加
149. Before long, the walls started to crumble from the inside out...
     不久之后 墙开始从内部碎裂
150. until finally, catastrophic collapse.
     最终导致灾难性的崩溃
151. In an instant,
     一瞬间

来自《我们星球上的生命 第一季 第八集 Life on Our Planet S01E08 冰与火的世纪》第 148 行