Decreasing volume on WTI futures

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A brief look on the CBoT fut. contracts allows to see a significant drop in volume of traded futures there (even if we assume a bit higher volume today as the session has not ended yet). A number of open interest is steadily growing now to 0.5M ( a natural number for an active contract).

Source: Bloomberg
Therefore, it's worth to take a look at detailed data in order to see trading activity (i.e. H1 interval).

Source: Bloomberg
Today's volume is outstandingly low. Are investors really afraid to buy that the price is falling more by selling from business activity than institutional investors?