Hassan... sorry to hear of your troubles,

There are definite procedures for wet equipment handling!

Immediately remove ALL POWER.
(THE MORE IMMEDIATE the better the results).

Open the equipment to the fullest extent possible... remove excess water.. and use compressed air to help move excessive moisture away.

WD40 (water displacement) is an excellent product for this purpose. If the water was clean... allow the unit to air-dry
TOTALLY before even thinking about restoring power.

If dirty, muddy or corrosive... rinse the unit with fresh clean water...
THEN proceed with the water removal...

After several DAYS... carefully look into & around electrical connections for any signs of corrosion or electrolysis...

Make an inventory of part to refurbish or replace.

Many connectors can be cleaned with Isopropyl Alcohol & conditioned with an anti-corrosive (no-ox compound, white lithium or even petroleum jelly) re-connected, refitted & re-used...

Other parts.... NOT-SO-MUCH...

Everything must be completely ABSOLUTELY dry & re-assembled before attempting to restore power.

Hope this helps...

Yes entire telephone exchanges have been in mud slides, hosed off... properly dried & restored to service (honest... SxS CDO).