Name:   Lifer - Subject:   Need help with boat Date:   6/5/2019 7:40:57 AM

It's just water coming through the cracks where the plywood meets. Most commonly where four corners meet. I have used sylicone in the past. Just apply from the bottom. If I were doing it today I would try flex seal tape. That stuff works.. Another possibility is the grommet where the cables come through the floor and you can use sylicone there also.

Hope this helps.