Something he's seen before.
Something they definitely don't want to deal with now.
The others see it just as Yesugen makes the first turn. It's there, just in front of you all

Thankfully, Dai knew to warn Yesugen to keep well away from it. It eventually noticed the car and started making its way towards you all, but with Dai's knowledge of the lay of the land, his previous mapping of a good route, and Yesugen's skillful driving, you quickly reach the checkpoint.
The wardens aren't sure why you seem to be in such a rush, but they don't ask questions, with all of you having permits - one of them Permanent.
You've survived this dive. You have the Rainbow Olm sample, as well as some other ones. Kioku will be happy, and you have a good story to tell.