I believe gernade were disabled underwater but for some reason chem lights were too.

Well technically speaking
nothing in real life would stop from throwing a grenade under water also.
If you are crazy enough.

Anyway definite +1

In RL not all glow stick sink, just as not all float, some are very slow to sink, some will only sink so far before they become neutrally buoyant, others will do conversely opposite if released at depth, one trait they ALL share is in water that has flow/currants they are useless unless tethered to something or water flow/currants will move them very easily, another trait is many (NOT ALL) that DO sink don’t lay on their side on the bottom, they take an end-up attitude due to any airspace and/or the displacement characteristics of the plastic housing and the position of the activator capsule within.

Likewise, if you compared the same make of glow stick, different colours would have different propensities to sink/float due to the different mixing ratios of the base chemicals in order to produce a specific colour.

Anyway the ones in the game sink relatively slowly mostly in a horizontal attitude and lay on the bottom in a horizontal manner lighting up quite a large surrounding area, BUT there are no flow/currants in the Arma 3 sea even with maximum waves and bad weather to move them around!

Still, would love to use them underwater, even for a brief moment if they floated away.

Why was throwing gernades and other objects disabled in the first place? It can happen underwater so why disable it? If you throw a gernade underwater, you live with the consequences not get the devs to disable it because your too lazy to remember not to do so yourself!

Dropping chem-lights, or possibly throwing grenades (through the air) while swimming/treading water on the surface might be useful (although potentially suicidal), but "throwing underwater" is physically impossible - there is far too much drag through the water to even move your arms fast enough, and then too much drag through the water for an object like a hand grenade or chem light to travel more than a meter.

Explosives are also far more dangerous for people in water than they are in air due waters incompressiblilty. You would be likely killed by any grenade explosion within throwing range. See links: http://science.howstuffworks.com/explosion-land-water1.htm
http://www.scuba-doc.com/uwblast.html

@ceeeb you are right, you can't throw, but you can drop it, or place it.

Regarding explosives, you are very right,
but in reality I can infact drop a grenade or any other thing under water.
Why should I do it? I don't know, but I can.

Yea, it's not an issue of "why should you do it" but an issue of you should be able to do it.

And regarding throwing underwater or on the surface, it would be more like dropping for bombing or lighting the area up quick.

I'm not really sure why this was removed in the first place. Chemlights in particular should be usable underwater as they can be use for marking or path tracing purposes.

Imagine a night time mission with an SDV insertion, you could use chem lights to mark you way back to the SDV.

It was removed after a few people complained about it, though it seems like a feature for players new to the game who might blow themselves up of something by accident.

It should be put back then as it was, what next a minimum safe distance when throwing a grenade on land.

Yep, and bullets will be replaced with nerf darts for added safety!

The underwater chem light is not a bad idea, it'd make for neat stealth missions underwater at night. However, throwing grenades underwater is totally pointless. Sure you can do it in real life, but in real life you can also pick your nose while doing the robot, but they're not about to implement that. However, throwing grenades while on the surface of the water would not be a bad idea, especially if it's a diver insertion. Overall this was down voted, seems too silly and impractical.

Actually wouldnt mind the ability to throw chemlights. They look really awesome at night underwater, i suggest people try it.
Grenades? Why not, you wouldnt be able to throw them far due to water density, so would be something to watch out. Why was this removed, i have no idea, seems silly, to take it out.

@trooper226: the game was like this before but a feedback tracker ticket made them just completely block throwing anything underwater which messed up night diving with chem lights.

Duplicate of #0005996.