Guild Wars 2

The underwater skills are sharing a cooldown with the same slot as the land based skill. Even when the skills are totally unrelated.

For example, given an engineer. In the slot 9 utility skill, on land I might have a Thumper Turret. I set the turret down, kill things, pick up the turret, and have a fairly long cooldown before I can use it again. No problem. I jump into the water, where utility skill 9 is my grenade kit. The grenade kit is not usable, it’s still using the cooldown from the Thumper Turret.

The Thumper Turret and grenade kit have nothing to do with each other except sharing a utility slot, and equipping/stowing the grenade kit should have essentially no cooldown at all.

The cooldown is not limited to the skills I name above, those are just used for example.

That was designed like that on purpose to prevent spamming and exploiting skills. If they didn’t share cooldowns, you could really abuse elite skills and such, especially in pvp maps with water.