How to seal concrete panel garage

I have a garage made from cast concrete panels. The gaps between the panels and at the bottom have clearly had an attempt at waterproofing in the past but it has failed, so now I get standing water when it rains.

What would you recommend to seal the gaps between and below the panels?

Probably won’t get the garage perfectly sealed since the door is at the bottom of a slope and there’s no drain, but hopefully I can improve it a bit.