done after someone dives (= jumps into water with their head and arms going in first, or swims under water with breathing equipment)

The Olympic diver was mobbed by the media in the post-dive press conference. 这位奥运跳水运动员在跳水后的新闻发布会上被媒体群起提问。

The data collected during the dive can be transferred post-dive to a PC. 潜水期间收集的数据可以在潜水后传输到电脑上去。

happening after something goes down very quickly or suddenly falls in value

Post-dive stock values will reduce consumer confidence, causing the economy to grow at a slower, more sustainable rate. 大幅贬值后的股票价值将降低消费者信心，导致经济以较慢、较为可持续的速度增长。