What kind of swimming pool was used in the 1908 Summer Olympics in London?
At the 1908 Summer Olympics in London, six swimming events were contested. These were the first Olympic Games in which a 100-metre pool had been especially constructed (inside the main stadium's track and field oval). Previous Olympic events were swum in open water (1896: The Mediterranean Sea, 1900: The Seine River, 1904: an artificial lake). Only men participated in the swimming events. The competitions were held from Monday, July 13, 1908, to Saturday, July 25, 1908.

All six of the 1908 events became staples of the Olympic swimming programme, and have been contested at every edition of the Games since. The 50 m, 200 m, and 800 m freestyle events were dropped from the previous edition (though the 50 m and 200 m would later return), the relay was lengthened from 4×50 yards to 4×200 m, and the 400 m breaststroke was shortened to 200 metres.
The 1908 Summer Olympics swimming competition was held in a specially constructed 100 meter swimming pool.
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
----------------
At the 1908 Summer Olympics in London, six swimming events were contested. These were the first Olympic Games in which a 100-metre pool had been especially constructed (inside the main stadium's track and field oval). Previous Olympic events were swum in open water (1896: The Mediterranean Sea, 1900: The Seine River, 1904: an artificial lake). Only men participated in the swimming events. The competitions were held from Monday, July 13, 1908, to Saturday, July 25, 1908.

All six of the 1908 events became staples of the Olympic swimming programme, and have been contested at every edition of the Games since. The 50 m, 200 m, and 800 m freestyle events were dropped from the previous edition (though the 50 m and 200 m would later return), the relay was lengthened from 4×50 yards to 4×200 m, and the 400 m breaststroke was shortened to 200 metres.
----------------
Answer the following query.
What kind of swimming pool was used in the 1908 Summer Olympics in London?

user
The 1908 Summer Olympics swimming competition was held in a specially constructed 100 meter swimming pool.
assistant