Section 1700.34 - Sonar dome discharge(a) The water inside the sonar dome must not be discharged for maintenance activities unless the use of a drydock for the maintenance activity is not feasible.(b) The water inside the sonar dome may be discharged for equalization of pressure between the interior and exterior of the dome.(c) A biofouling chemical that is bioaccumulative should not be applied to the exterior of a sonar dome when a non-bioaccumulative alternative is available. 85 FR 43476 , July 17, 2020 82 FR 3183 , 2/10/2017; 85 FR 43476 , 8/17/2020