In the OP of this great series, Muromi opens by making a series of underwater hand-signals.  Here is the official international list of underwater hand signals for SCUBA divers.  See if you can guess the meaning of each and then give the correct interpretation of Muromi's OP hand signal message:

Table of Hand Signals

Signal Meaning?
1.

Hand raised, fingers pointed up, palm to receiver.
2.

Thumb extended downward from clenched fist.
3.

Thumb extended upward from clenched fist.
4.

Thumb and forefinger making a circle with three remaining fingers extended (if possible).
5.

Two arms extended overhead with finger tips touching above head to make a large O shape.
6.

Hand flat, fingers together, palm down, thumb sticking out, then hand rocking back and forth on axis of forearm.
7.

Hand waving over head (may also thrash hand on water).
8.

Fist pounding on chest.
9.

Hand slashing or chopping throat.
10.

Clenched fist on arm extended in direction of danger.

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Answer Key.  The (not real) Meaning:

1. "I swear it's true!" or "Don't try it, buddy!" or "5!"
2. "Bad date."
3. "He paid the dinner check for both of us."
4. "This small..."
5. "This BIG!"
6. "His preferred technique, tailside."
7. "My comments went way over his head."
8. "My heart went "doki doki!"
9. "That/this relationship is OVER!"
10. "Sure, you can date him if you want."

And Muromi's message to you: "Let's have a date!  Meet me in 3 minutes over there (*points*) after the OP is over."

(Another premise explored and beaten to death.  However, an actual answer to what the gestures mean would be welcome.)

(What was with the "NATO" baseball cap last week?)