5. Vessels, Net


			Accumulated
	Cost		depreciation		Net book Value
Balance, April 1, 2019	$	1,732,993,810	$	(254,473,496)	$	1,478,520,314
Other additions		17,460,014		—		17,460,014
Depreciation		—		(48,814,256)		(48,814,256)
Balance, December 31, 2019	$	1,750,453,824	$	(303,287,752)	$	1,447,166,072

Additions to vessels, net mainly consisted of installments on the purchase of scrubbers for ten of our VLGCs during the nine months ended December 31, 2019. Our vessels, with a total carrying value of $1,447.2 million and $1,478.5 million as of December 31, 2019 and March 31, 2019, respectively, are first‑priority mortgaged as collateral for our long-term debt (refer to Note 6 below). No impairment loss was recorded for the periods presented.