Water in Front diff.

Hi all, I’m having trouble with my front differential is always full of water. I’m in water maybe up to the tires at the most but never high enough to get in my vent. I have checked the vent line, it’s not cracked or broken and I have already replaced all 3 seals. I’m just wondering if anybody has had any troubles with water getting in through the 4×4 actuator . Thanks