'The ever faithful pistol shrimp' (Alpheus ochrostriatus)

Air Prang, Lembeh.
Here in the good company of its partner watch-dog goby Amblyeleotris periophthalma (just as in this reference: https://www.advancedaquarist.com/2013/1/fish)
In quoting the reference:
<It is quite common to observe these gobies watching the burrow entrance, in strict physical contact with the shrimp's antenna, while he approaches the surface to eliminate the material excavated from the burrow. Shrimp's eyes, used to the burrow's darkness, are almost blind out of the hole and the he could be a too-easy prey without the protection and the continuous surveillance of the goby. On the other hand, the goby is not able to dig a hole by itself, and if a burrow not well maintained would collapse in a very short time. When a danger approaches, the goby first signals it to the shrimp by flippering the caudal fin. If the danger gets worst, the goby turns rapidly escaping inside the burrow>
And it is not because is blind that it is not a toughie as it has a claw that uses to deliver forceful punch "like a pistol, to snap shut whenever necessary" -> More interesting facts on pistol shrimps here:
https://www.leisurepro.com/blog/explore-the-blue/pump-volume-pistol-shrimp/