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What is mstd in scuba diving?

MSTD stands for Minimum Safe Thermal Distance. It is the minimum distance a diver should maintain from a decompression chamber or bell when in the water. This distance is necessary to prevent the diver from being pulled into the chamber or bell by the suction created by the pumps.

The MSTD is typically 10 feet (3 meters), but it can vary depending on the size and type of chamber or bell. Divers should always check with the chamber or bell operator for the specific MSTD for that particular unit.

It is important to maintain the MSTD at all times when in the water. If a diver is pulled into the chamber or bell, they could be seriously injured or killed.

Factors that can affect the MSTD

There are a number of factors that can affect the MSTD, including:

The size and type of chamber or bell
The depth of the water
The current
The visibility

Divers should always consider these factors when determining the MSTD.

Consequences of violating the MSTD

Violating the MSTD can have serious consequences, including:

Being pulled into the chamber or bell
Serious injury or death

Divers should always follow the MSTD to avoid these risks.

How to maintain the MSTD

There are a few simple steps divers can follow to maintain the MSTD, including:

Stay at least 10 feet (3 meters) away from the chamber or bell at all times
Do not approach the chamber or bell from the front
If you need to approach the chamber or bell, do so slowly and carefully
Be aware of the current and visibility

By following these simple steps, divers can help to ensure their safety when diving.


The MSTD is an important safety measure that all divers should be aware of. By following the MSTD, divers can help to avoid serious injury or death.

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