KanjiJLPT N1
Submerge

submerge, conceal, hide, lower (voice), hush

Mnemonic

A massive storm rolls in while two traders exchange cargo on deck. Waves crash so violently they must submerge the entire ship below the surface, hiding in an underwater air pocket until the storm passes. The exchange can wait—survival cannot.
Additional thoughts
Visualize the storm pushing everything downward while the traders clutch their goods mid-exchange. Storm on top, exchange below — together they force you to submerge. The ship sinking beneath waves ties both radicals neatly to the keyword.
Quick recall
A storm mid-exchange forces everyone to submerge beneath the waves.

Details

The keyword for 潜 is submerge. This kanji refers to the act of going beneath the surface of water or hiding oneself from view. It conveys the idea of diving underwater, concealing, or operating in a hidden, covert manner. By extension, it can also suggest latent or dormant qualities that lie beneath the surface, unseen but present.
On'yomi
せん
Kun'yomi
ひそ.む、もぐ.る、かく.れる、くぐ.る、ひそ.める