Reef Camera Trap Light Switch

[MAR_SCI]

I am a marine scientist and I use camera traps to investigate sharks on remote reefs. I have a camera and battery system in a sealed housing that can film for three days. To film at night I have purchased these dive torches/lights with battery packs (

https://www.orcatorch.com/product/D620.html),

which will form seperate sealed units on the overall camera rig. I need a device (likely mechanical as electrical will mean sealing it to withstand 100m depth) that can press/trigger/activate the torches on/off button at a set time (e.g. nightfall). Please let me know if you have any ideas or solutions!