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Diving straight down could take no effort

I didn't find RAW about diving rules, and I know you didn't want a simulation, but D&D is modelled approximately on real life

Without protection, we will die at around 300 feet

So, will we die or not? If we breathe and have no protection against pressure, according to this link without protection from this pressure, Humans cap out at around 300 feet in depth:

At depths beginning around 100 feet, it gives a sense of euphoria or drunkenness. By 300 feet, it causes loss of consciousness and death.

Someone in heavy armor would have the easiest time diving straight down, because they are more dense than someone in no armor. Weights could also help make a dive easier.

See this source for information about Ocean water density.

We also need to know whether we're dealing with salt water or not.

The density of pure water is 1000 kg/m3. Ocean water is more dense because of the salt in it. Density of ocean water at the sea surface is about 1027 kg/m3.

 

There are two main factors that make ocean water more or less dense than about 1027 kg/m3: the temperature of the water and the salinity of the water.

Any swimming effort would be counteracted by the density difference. Real-life divers use Buoyancy compensators to control this.

Anyone who fought against a very large buoyancy difference would quickly tire out, but someone able to control their buoyancy could use next to zero effort to dive or ascend.

RAW - absolute cold and crushing pressureh

Plane of Water DMG 56

... the absolute cold and crushing pressure mean a swift end to creatures accustomed to the surface or the Sea of Light.

But...

If you still think we should ignore pressure/temperature since very deep water is not the Plane of Water, then I point you over to Dale M's answer with the caveat that movement speed would have to be 15 per DMG 252:

Dashing: A chase participant can freely use the Dash action a number of times equal to 3 + its Constitution modifier. Each additional Dash action it takes during the chase requires the creature to succeed on a DC 10 Constitution check at the end of its turn or gain 1 level of exhaustion.

Also, Dash is only mentioned in the PHB in the combat actions section. I'd like to see how far people could get at half the speed based on his calculations and on the forced march rules. So perhaps we could even allow speed of 20 (40 / 2).

Diving straight down could take no effort

I didn't find RAW about diving rules, and I know you didn't want a simulation, but D&D is modelled approximately on real life

Without protection, we will die at around 300 feet

So, will we die or not? If we breathe and have no protection against pressure, according to this link without protection from this pressure, Humans cap out at around 300 feet in depth:

At depths beginning around 100 feet, it gives a sense of euphoria or drunkenness. By 300 feet, it causes loss of consciousness and death.

Someone in heavy armor would have the easiest time diving straight down, because they are more dense than someone in no armor. Weights could also help make a dive easier.

See this source for information about Ocean water density.

We also need to know whether we're dealing with salt water or not.

The density of pure water is 1000 kg/m3. Ocean water is more dense because of the salt in it. Density of ocean water at the sea surface is about 1027 kg/m3.

 

There are two main factors that make ocean water more or less dense than about 1027 kg/m3: the temperature of the water and the salinity of the water.

Any swimming effort would be counteracted by the density difference. Real-life divers use Buoyancy compensators to control this.

Anyone who fought against a very large buoyancy difference would quickly tire out, but someone able to control their buoyancy could use next to zero effort to dive or ascend.

RAW - absolute cold and crushing pressureh

Plane of Water DMG 56

... the absolute cold and crushing pressure mean a swift end to creatures accustomed to the surface or the Sea of Light.

But...

If you still think we should ignore pressure/temperature since very deep water is not the Plane of Water, then I point you over to Dale M's answer with the caveat that movement speed would have to be 15 per DMG 252:

Dashing: A chase participant can freely use the Dash action a number of times equal to 3 + its Constitution modifier. Each additional Dash action it takes during the chase requires the creature to succeed on a DC 10 Constitution check at the end of its turn or gain 1 level of exhaustion.

Also, Dash is only mentioned in the PHB in the combat actions section. I'd like to see how far people could get at half the speed based on his calculations and on the forced march rules. So perhaps we could even allow speed of 20 (40 / 2).

Diving straight down could take no effort

I didn't find RAW about diving rules, and I know you didn't want a simulation, but D&D is modelled approximately on real life

Without protection, we will die at around 300 feet

So, will we die or not? If we breathe and have no protection against pressure, according to this link without protection from this pressure, Humans cap out at around 300 feet in depth:

At depths beginning around 100 feet, it gives a sense of euphoria or drunkenness. By 300 feet, it causes loss of consciousness and death.

Someone in heavy armor would have the easiest time diving straight down, because they are more dense than someone in no armor. Weights could also help make a dive easier.

See this source for information about Ocean water density.

We also need to know whether we're dealing with salt water or not.

The density of pure water is 1000 kg/m3. Ocean water is more dense because of the salt in it. Density of ocean water at the sea surface is about 1027 kg/m3.

There are two main factors that make ocean water more or less dense than about 1027 kg/m3: the temperature of the water and the salinity of the water.

Any swimming effort would be counteracted by the density difference. Real-life divers use Buoyancy compensators to control this.

Anyone who fought against a very large buoyancy difference would quickly tire out, but someone able to control their buoyancy could use next to zero effort to dive or ascend.

RAW - absolute cold and crushing pressureh

Plane of Water DMG 56

... the absolute cold and crushing pressure mean a swift end to creatures accustomed to the surface or the Sea of Light.

But...

If you still think we should ignore pressure/temperature since very deep water is not the Plane of Water, then I point you over to Dale M's answer with the caveat that movement speed would have to be 15 per DMG 252:

Dashing: A chase participant can freely use the Dash action a number of times equal to 3 + its Constitution modifier. Each additional Dash action it takes during the chase requires the creature to succeed on a DC 10 Constitution check at the end of its turn or gain 1 level of exhaustion.

Also, Dash is only mentioned in the PHB in the combat actions section. I'd like to see how far people could get at half the speed based on his calculations and on the forced march rules. So perhaps we could even allow speed of 20 (40 / 2).

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General Anders
General Anders
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Diving straight down could take no effort

I didn't find RAW about diving rules, and I know you didn't want a simulation, but D&D is modelled approximately on real life

Without protection, we will die at around 300 feet

So, will we die or not? If we breathe and have no protection against pressure, according to this link without protection from this pressure, Humans cap out at around 300 feet in depth:

At depths beginning around 100 feet, it gives a sense of euphoria or drunkenness. By 300 feet, it causes loss of consciousness and death.

Someone in heavy armor would have the easiest time diving straight down, because they are more dense than someone in no armor. Weights could also help make a dive easier.

See this source for information about Ocean water density.

We also need to know whether we're dealing with salt water or not.

The density of pure water is 1000 kg/m3. Ocean water is more dense because of the salt in it. Density of ocean water at the sea surface is about 1027 kg/m3.

There are two main factors that make ocean water more or less dense than about 1027 kg/m3: the temperature of the water and the salinity of the water.

Any swimming effort would be counteracted by the density difference. Real-life divers use Buoyancy compensators to control this.

Anyone who fought against a very large buoyancy difference would quickly tire out, but someone able to control their buoyancy could use next to zero effort to dive or ascend.

RAW - absolute cold and crushing pressureh

Plane of Water DMG 56

... the absolute cold and crushing pressure mean a swift end to creatures accustomed to the surface or the Sea of Light.

But...

If you still think we should ignore pressure/temperature since very deep water is not the Plane of Water, then I point you over to Dale M's answer with the caveat that movement speed would have to be 15 per DMG 252:

Dashing: A chase participant can freely use the Dash action a number of times equal to 3 + its Constitution modifier. Each additional Dash action it takes during the chase requires the creature to succeed on a DC 10 Constitution check at the end of its turn or gain 1 level of exhaustion.

Also, Dash is only mentioned in the PHB in the combat actions section. I'd like to see how far people could get at half the speed based on his calculations and on the forced march rules. So perhaps we could even allow speed of 20 (40 / 2).